CVE-2025-53770

CRITICAL KEV RANSOMWARE NUCLEI

Microsoft SharePoint Server - Code Injection

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2025-53770 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added July 20, 2025, with confirmed use in ransomware campaigns. EIP tracks 50 public exploits from researchers including Agampreet Singh, soltanali0, MuhammadWaseem29, including a Metasploit module exploits/windows/http/sharepoint_toolpane_rce. A Nuclei detection template is also available.

AI-analyzed exploit summary This exploit leverages unsafe deserialization in SharePoint Server 2019's ToolPane.aspx via the Scorecard:ExcelDataSet control to achieve unauthenticated RCE. It extracts and decodes a compressed payload from the response.

Description

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

Exploits (50)

exploitdb WORKING POC
by Agampreet Singh · pythonremotewindows
https://www.exploit-db.com/exploits/52405

This exploit leverages unsafe deserialization in SharePoint Server 2019's ToolPane.aspx via the Scorecard:ExcelDataSet control to achieve unauthenticated RCE. It extracts and decodes a compressed payload from the response.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2019 (16.0.10383.20020)
No auth needed
Prerequisites: Target SharePoint Server 2019 instance · Network access to the target
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 311 stars
by soltanali0 · remote
https://github.com/soltanali0/CVE-2025-53770-Exploit

This repository contains a functional exploit for CVE-2025-53770, targeting a .NET deserialization vulnerability in Microsoft SharePoint via the ToolPane.aspx endpoint. The exploit includes a Python-based tool for injecting malicious WebParts and a .NET utility (YSLosf) for generating serialized payloads.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016 (16.0.4351.1000 - 16.0.5508.1000), SharePoint Server 2019 (16.0.10337.12109 - 16.0.10417.20027)
Auth required
Prerequisites: Authenticated access to SharePoint · Access to /layouts/15/ToolPane.aspx endpoint · Ability to generate .NET serialized payloads
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC 55 stars
by MuhammadWaseem29 · remote
https://github.com/MuhammadWaseem29/CVE-2025-53770

The repository provides a functional exploit PoC for CVE-2025-53770, demonstrating unauthenticated remote code execution via unsafe deserialization in Microsoft SharePoint Server. The PoC includes a crafted HTTP request with a malicious payload targeting a vulnerable endpoint, along with commands to decode and extract the payload.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server
No auth needed
Prerequisites: Access to the target SharePoint Server · Network connectivity to the target
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER 44 stars
by hazcod · remote
https://github.com/hazcod/CVE-2025-53770

This repository contains a scanner for CVE-2025-53770, a SharePoint unauthenticated RCE vulnerability. It checks for vulnerability by injecting a marker in the SharePoint ToolBox widget and detecting its presence in the server response.

Classification
Scanner 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (on-prem)
No auth needed
Prerequisites: Access to SharePoint server · Network connectivity to target
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SUSPICIOUS 43 stars
by kaizensecurity · remote
https://github.com/kaizensecurity/CVE-2025-53770

The repository contains only a README with a disclaimer and an image link, lacking any technical details or exploit code. It appears to be a placeholder or lure without substantive content.

Classification
Suspicious 90%
Attack Type
Other
Complexity
Theoretical
Reliability
Theoretical
Target: Microsoft SharePoint
No auth needed
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER 18 stars
by ZephrFish · poc
https://github.com/ZephrFish/CVE-2025-53770-Scanner

This repository contains a scanner for CVE-2025-53770, a deserialization vulnerability in SharePoint's ExcelDataSet component. The scanner detects vulnerable instances by analyzing responses to crafted POST requests and identifying machine key extraction patterns and secondary payload deployment.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (2013, 2016, and later versions)
No auth needed
Prerequisites: Access to SharePoint ToolPane endpoints · Network connectivity to target SharePoint instances
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER 14 stars
by 3a7 · remote
https://github.com/3a7/CVE-2025-53770

The repository contains a Python script that scans for CVE-2025-53770, an unauthenticated RCE vulnerability in Microsoft SharePoint. It checks for specific headers and responses to determine if a target is vulnerable but does not include exploit code.

Classification
Scanner 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: Target must be running a vulnerable version of Microsoft SharePoint
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP 8 stars
by AdityaBhatt3010 · poc
https://github.com/AdityaBhatt3010/CVE-2025-53770-SharePoint-Zero-Day-Variant-Exploited-for-Full-RCE

This repository provides a detailed technical analysis of CVE-2025-53770, an unauthenticated RCE vulnerability in Microsoft SharePoint, including root cause, attack flow, and mitigation strategies. It references real-world exploitation and connects it to CVE-2025-49706.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019, Subscription Edition
No auth needed
Prerequisites: Vulnerable SharePoint instance exposed to the internet · Unpatched system (pre-July 2025 updates)
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 4 stars
by saladin0x1 · remote
https://github.com/saladin0x1/CVE-2025-53770

This repository contains a functional exploit for CVE-2025-53770, targeting a SharePoint ToolPane vulnerability that allows unauthenticated remote code execution via authentication bypass and unsafe deserialization. It includes Python-based exploit code, a scanner for vulnerable targets, and detailed analysis tools.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2019
No auth needed
Prerequisites: Python 3.x with requests and urllib3 libraries · Network access to target SharePoint servers
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 4 stars
by Immersive-Labs-Sec · remote
https://github.com/Immersive-Labs-Sec/SharePoint-CVE-2025-53770-POC

This repository contains a functional C# tool that generates a malicious .NET DataSet payload for CVE-2025-53770, a SharePoint deserialization vulnerability. The tool wraps a ysoserial.net-generated payload in a custom XML schema and diffgram, serializes it using BinaryFormatter, and outputs a GZipped Base64-encoded payload.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (version not specified)
No auth needed
Prerequisites: A ysoserial.net-generated payload (e.g., LosFormatter with TypeConfuseDelegate gadget)
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC 4 stars
by exfil0 · remote
https://github.com/exfil0/CVE-2025-53770

The repository contains a functional Python exploit tool for CVE-2025-53770, targeting unauthenticated RCE in Microsoft SharePoint Server via deserialization in `/_layouts/15/ToolPane.aspx`. It includes features for reconnaissance, payload generation, bypasses, and verification.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019, Subscription Edition
No auth needed
Prerequisites: Python 3.8+ · ysoserial.net for .NET deserialization payloads · Access to `/_layouts/15/ToolPane.aspx`
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER 3 stars
by Bluefire-Redteam-Cybersecurity · poc
https://github.com/Bluefire-Redteam-Cybersecurity/bluefire-sharepoint-cve-2025-53770

This repository contains detection and remediation scripts for CVE-2025-53770, a deserialization vulnerability in Microsoft SharePoint Server. It includes PowerShell scripts to detect vulnerable versions, check for patches, and remediate by enabling AMSI and rotating MachineKeys.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019, Subscription Edition
No auth needed
Prerequisites: Access to SharePoint Server environment · PowerShell execution rights
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC 2 stars
by Rabbitbong · remote
https://github.com/Rabbitbong/OurSharePoint-CVE-2025-53770

This repository contains a functional C# tool that generates a malicious .NET DataSet payload for CVE-2025-53770, leveraging a LosFormatter deserialization gadget chain. The tool wraps a ysoserial.net payload in a custom XML schema and diffgram, serializes it, and outputs a GZipped Base64-encoded payload for exploitation.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (specific version not specified)
No auth needed
Prerequisites: A Base64-encoded ysoserial.net payload (e.g., LosFormatter gadget) · Access to a vulnerable SharePoint instance
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER 2 stars
by Sec-Dan · poc
https://github.com/Sec-Dan/CVE-2025-53770-Scanner

This repository contains a Python-based scanner for detecting potential exposure to CVE-2025-53770, a critical SharePoint vulnerability. The tool performs subdomain enumeration and checks for signs of vulnerability without exploiting it.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019, and Subscription Edition
No auth needed
Prerequisites: Target domain name · Internet access for subdomain enumeration
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP 1 stars
by anwakub · poc
https://github.com/anwakub/CVE-2025-53770

This repository provides a detailed technical advisory for CVE-2025-53770, a critical remote code execution vulnerability in Microsoft SharePoint Server due to deserialization of untrusted data. It includes vulnerability details, impact analysis, mitigation steps, and references to official resources.

Classification
Writeup 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (On-Premises)
No auth needed
Prerequisites: Network access to vulnerable SharePoint Server
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP 1 stars
by Cameloo1 · poc
https://github.com/Cameloo1/sharepoint-toolshell-micro-postmortem

This repository provides a detailed postmortem analysis of the 'ToolShell' campaign targeting Microsoft SharePoint Server (on-prem) via CVE-2025-53770, including detection hunts, communication templates, and technical breakdowns of the attack flow. It emphasizes deserialization abuse, webshell deployment, and lateral movement techniques.

Classification
Writeup 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (on-prem)
No auth needed
Prerequisites: Internet-exposed SharePoint/IIS server · Ability to send crafted deserialization payloads · Access to exploit ViewState abuse
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP 1 stars
by paolokappa · poc
https://github.com/paolokappa/SharePointSecurityMonitor

This repository contains PowerShell scripts and workflows for a SharePoint security monitoring tool, focusing on modular architecture and demonstration of security monitoring capabilities. It does not contain exploit code but provides detailed technical documentation and scripts for security monitoring.

Classification
Writeup 90%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: Microsoft SharePoint
Auth required
Prerequisites: Access to SharePoint environment · PowerShell execution privileges
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER 1 stars
by imbas007 · poc
https://github.com/imbas007/CVE-2025-53770-Vulnerable-Scanner

This repository contains a Python-based scanner for detecting CVE-2025-53770 in SharePoint hosts. It uses custom payloads and detection rules to identify vulnerable systems, routing traffic through Burp Suite for analysis.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (versions not specified)
No auth needed
Prerequisites: Python 3.7+ · requests library · Burp Suite (optional) · config.json · payload.json · target list
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER 1 stars
by tripoloski1337 · poc
https://github.com/tripoloski1337/CVE-2025-53770-scanner

The repository contains a Python script designed to scan for CVE-2025-53770 by checking the availability of a specific SharePoint endpoint. It does not include exploit code but verifies the presence of a vulnerable endpoint.

Classification
Scanner 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Microsoft SharePoint (version not specified)
No auth needed
Prerequisites: Target URLs listed in a file named 'targets.txt'
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP
by doerrdan · poc
https://github.com/doerrdan/it-sec-toolshell

This repository contains a detailed technical presentation and analysis of CVE-2025-53770, a critical SharePoint vulnerability. It includes slides covering the attack vector, technical workflow, mitigation steps, and lessons learned, but no functional exploit code.

Classification
Writeup 95%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: Microsoft SharePoint
No auth needed
Prerequisites: Access to SharePoint server · Vulnerable version of SharePoint
devstral-2 · analyzed May 30, 2026 Full analysis →
nomisec WRITEUP
by Zedocun · poc
https://github.com/Zedocun/SharePoint-ToolShell-CVE-2025-53770-Incident-Analysis

This repository provides a detailed incident analysis of CVE-2025-53770, documenting the exploitation chain, including RCE, webshell deployment, and credential extraction in SharePoint. It includes IOCs, MITRE ATT&CK mappings, and a timeline but lacks functional exploit code.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: Vulnerable SharePoint instance · Network access to target
devstral-2 · analyzed Apr 09, 2026 Full analysis →
nomisec SCANNER
by rbctee · remote
https://github.com/rbctee/CVE-2025-53770

This repository contains a scanner for CVE-2025-53770, an unauthenticated SharePoint RCE vulnerability. It checks for vulnerability by injecting a harmless marker and detecting its presence in the server response, without executing malicious payloads.

Classification
Scanner 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (on-prem)
No auth needed
Prerequisites: Target running unpatched SharePoint Server
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER
by zach115th · poc
https://github.com/zach115th/ToolShellFinder

This repository contains a PowerShell script designed to scan IIS logs for indicators of compromise (IoCs) related to CVE-2025-53770 and CVE-2025-53771 in Microsoft SharePoint. It does not exploit the vulnerabilities but detects potential exploitation attempts by analyzing log patterns.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (versions affected by CVE-2025-53770 and CVE-2025-53771)
No auth needed
Prerequisites: Access to IIS log files · PowerShell 7+ environment
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP
by victormbogu1 · poc
https://github.com/victormbogu1/LetsDefend-SOC342-CVE-2025-53770-SharePoint-ToolShell-Auth-Bypass-andRCE-EventID-320

This repository contains a detailed technical analysis of CVE-2025-53770, a SharePoint zero-day vulnerability (ToolShell) that allows unauthenticated RCE via crafted POST requests to ToolPane.aspx. The writeup includes forensic steps, containment actions, and a breakdown of the attack process, but does not include functional exploit code.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Theoretical
Target: Microsoft SharePoint Server
No auth needed
Prerequisites: Access to SharePoint Server · Network connectivity to target
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP
by Michaael01 · poc
https://github.com/Michaael01/LetsDefend--SOC-342-CVE-2025-53770-SharePoint-Exploit-ToolShell

This repository provides a detailed technical analysis of CVE-2025-53770, a critical SharePoint vulnerability involving unauthenticated RCE via insecure deserialization and MachineKey abuse. It includes attack chain breakdown, endpoint analysis, and IoCs but lacks functional exploit code.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server
No auth needed
Prerequisites: Access to vulnerable SharePoint instance · Network connectivity to target
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER
by daryllundy · poc
https://github.com/daryllundy/CVE-2025-53770

This repository contains detection scripts for identifying systems vulnerable to CVE-2025-53770, a deserialization vulnerability. It includes both PowerShell and Python implementations for scanning networks and generating structured JSON reports.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Systems with unsafe deserialization practices (e.g., Java ObjectInputStream, Python pickle/yaml)
No auth needed
Prerequisites: Network access to target systems · Open ports (80, 443, 8080, etc.)
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by go-bi · remote
https://github.com/go-bi/sharepoint-CVE-2025-53770

This repository contains a functional exploit for CVE-2025-53770, targeting SharePoint Server 2019 via a deserialization vulnerability in the ToolPane.aspx endpoint. The exploit constructs a multi-stage payload involving base64 encoding, gzip compression, and PowerShell execution to achieve remote code execution (RCE).

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Microsoft SharePoint Server 2019
No auth needed
Prerequisites: Access to the target SharePoint server · Network connectivity to the target
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC
by ghostn4444 · remote
https://github.com/ghostn4444/CVE-2025-53770

This repository contains a functional proof-of-concept exploit for CVE-2025-53770, a critical deserialization vulnerability in Microsoft SharePoint Server. The exploit demonstrates remote code execution by leveraging insecure deserialization and an authentication bypass via HTTP header manipulation.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (Subscription Edition, 2019, 2016)
No auth needed
Prerequisites: Access to a vulnerable SharePoint Server instance · Ability to send crafted HTTP requests
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WRITEUP
by CyprianAtsyor · poc
https://github.com/CyprianAtsyor/ToolShell-CVE-2025-53770-SharePoint-Exploit-Lab-LetsDefend

This repository provides a detailed technical analysis of CVE-2025-53770, a critical deserialization vulnerability in Microsoft SharePoint Server. It includes an attack breakdown, PowerShell payload analysis, and forensic steps taken during a LetsDefend lab exercise.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (on-premises)
No auth needed
Prerequisites: Access to vulnerable SharePoint Server · Ability to send crafted POST requests to /ToolPane.aspx · Spoofed referer header to bypass authentication
devstral-2 · analyzed Feb 18, 2026 Full analysis →
github SCANNER
by behnamvanda · shellinfoleak
https://github.com/behnamvanda/CVE-2025-53770-Checker

This repository contains a bash script that checks for the presence of CVE-2025-53770, a SharePoint deserialization vulnerability, by sending a crafted payload to the target endpoint and verifying the response. It does not execute arbitrary code but confirms vulnerability by detecting a specific string in the response.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019
No auth needed
Prerequisites: Access to the target SharePoint server's _layouts/15/ToolPane.aspx endpoint
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by Agampreet-Singh · infoleak
https://github.com/Agampreet-Singh/CVE-2025-53770

This repository contains a functional exploit for CVE-2025-53770, demonstrating unauthenticated RCE in Microsoft SharePoint Server 2019 via unsafe .NET deserialization in the `Scorecard:ExcelDataSet` control within `ToolPane.aspx`. The exploit sends a crafted payload to trigger deserialization and extracts the response for analysis.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2019 (v16.0.10383.20020)
No auth needed
Prerequisites: Python 3.x · Vulnerable SharePoint Server 2019 instance · Network access to target
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by harryhaxor · remote
https://github.com/harryhaxor/CVE-2025-53770-SharePoint-Deserialization-RCE-PoC

This repository contains a functional exploit for CVE-2025-53770, a critical deserialization vulnerability in Microsoft SharePoint Server. The PoC demonstrates unauthenticated remote code execution by sending a crafted POST request with a malicious payload embedded in the 'MSOTlPn_DWP' parameter.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server
No auth needed
Prerequisites: Network access to the target SharePoint Server · Target server must be vulnerable to CVE-2025-53770
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER
by bitsalv · poc
https://github.com/bitsalv/ToolShell-Honeypot

This repository is a Docker-based honeypot designed to detect and log exploitation attempts against Microsoft SharePoint vulnerabilities, including CVE-2025-53770. It does not contain exploit code but provides advanced detection mechanisms such as YARA rules, tag-based classification, and payload analysis.

Classification
Scanner 95%
Attack Type
Other
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: Docker environment · Self-signed certificate for HTTPS
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER
by 0xisfet · poc
https://github.com/0xisfet/CVE-2025-53770-Scanner

The repository contains a Python-based scanner for detecting CVE-2025-53770, an insecure deserialization vulnerability in Microsoft SharePoint. It sends a crafted payload to the `ToolPane.aspx` endpoint and checks for specific markers in the response to determine vulnerability.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: curl · base64 · gzip · Python 3.x · colorama
devstral-2 · analyzed Apr 26, 2026 Full analysis →
nomisec SCANNER
by 0x-crypt · remote
https://github.com/0x-crypt/CVE-2025-53770-Scanner

This repository contains a Python-based scanner for detecting CVE-2025-53770, an insecure deserialization vulnerability in Microsoft SharePoint. The tool sends a crafted payload to the `ToolPane.aspx` endpoint and checks for specific markers in the response to identify vulnerable instances.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: Access to the target SharePoint instance · curl, base64, and gzip installed on the system
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by r3xbugbounty · remote
https://github.com/r3xbugbounty/CVE-2025-53770

This repository contains a functional exploit for CVE-2025-53770, targeting SharePoint via a crafted POST request to ToolPane.aspx. The exploit leverages a deserialization vulnerability in the ExcelDataSet component to achieve remote code execution (RCE).

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (likely 2016 or 2019, given the assembly versions)
No auth needed
Prerequisites: Target SharePoint server accessible via HTTP/HTTPS · ToolPane.aspx endpoint reachable · No authentication required (or valid session if auth is needed)
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP
by bossnick98 · poc
https://github.com/bossnick98/-SOC342---CVE-2025-53770-SharePoint-ToolShell-Auth-Bypass-and-RCE

This repository provides a detailed technical analysis of CVE-2025-53770, a deserialization vulnerability in Microsoft SharePoint Server. It includes an investigation of the exploit chain, MITRE ATT&CK techniques, and indicators of compromise (IoCs), but does not contain functional exploit code.

Classification
Writeup 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Theoretical
Target: Microsoft SharePoint Server (on-premises)
No auth needed
Prerequisites: Network access to vulnerable SharePoint Server · Unpatched SharePoint Server
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by BirdsAreFlyingCameras · remote
https://github.com/BirdsAreFlyingCameras/CVE-2025-53770_Raw-HTTP-Request-Generator

This PoC exploits a deserialization vulnerability in Microsoft SharePoint (CVE-2025-53770) by crafting a malicious HTTP request that delivers a base64-encoded PowerShell payload. The payload writes an ASPX file to a SharePoint directory, achieving remote code execution (RCE).

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (likely 2016/2019/Subscription Edition)
No auth needed
Prerequisites: Network access to the target SharePoint server · A malicious ASPX payload file
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by Udyz · remote
https://github.com/Udyz/CVE-2025-53770-Exploit

This repository provides a functional exploit for CVE-2025-53770, leveraging a deserialization vulnerability in SharePoint to achieve remote code execution (RCE). The exploit uses ysoserial.exe to generate a malicious ViewState payload, which is then sent via a crafted POST request to execute arbitrary commands on the target server.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: Access to the target SharePoint page to extract __VIEWSTATEGENERATOR, VALIDATION_KEY, and VALIDATION_ALG values · ysoserial.exe for generating the malicious payload
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER
by nisargsuthar · poc
https://github.com/nisargsuthar/suricata-rule-CVE-2025-53770

This repository contains Suricata detection rules for identifying exploitation attempts of CVE-2025-53770, a SharePoint RCE vulnerability. The rules target specific HTTP request patterns associated with the exploit but do not include functional exploit code.

Classification
Scanner 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint
No auth needed
Prerequisites: Network access to the target SharePoint server
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP
by bharath-cyber-root · poc
https://github.com/bharath-cyber-root/sharepoint-toolshell-cve-2025-53770

This repository provides a detailed technical analysis of CVE-2025-53770, a critical RCE vulnerability in Microsoft SharePoint Server. It explains the exploit chain involving authentication bypass and unsafe deserialization, along with remediation steps.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019, and Subscription Edition
No auth needed
Prerequisites: Access to SharePoint Server · Ability to send crafted HTTP requests
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by 0xray5c68616e37 · remote
https://github.com/0xray5c68616e37/cve-2025-53770

The repository provides a functional exploit PoC for CVE-2025-53770, demonstrating unauthenticated RCE in Microsoft SharePoint Server via unsafe deserialization. The PoC includes a curl command to trigger the vulnerability and extract a malicious payload.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server
No auth needed
Prerequisites: Access to a vulnerable SharePoint Server instance
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by GreenForceNetworks · poc
https://github.com/GreenForceNetworks/Toolshell_CVE-2025-53770

This repository contains a functional exploit for CVE-2025-53770, targeting SharePoint via ViewState manipulation to upload a webshell and achieve remote code execution (RCE). The exploit leverages crafted __VIEWSTATE, __VIEWSTATEGENERATOR, and __EVENTVALIDATION parameters to bypass validation and deploy a malicious ASPX shell.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (version unspecified)
No auth needed
Prerequisites: Access to a vulnerable SharePoint instance · Valid __VIEWSTATE, __VIEWSTATEGENERATOR, and __EVENTVALIDATION tokens from the target
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER
by grupooruss · poc
https://github.com/grupooruss/CVE-2025-53770-Checker

This repository contains a Python script designed to detect the presence of CVE-2025-53770, a critical .NET deserialization vulnerability in SharePoint Server, by checking version numbers and testing for deserialization errors. It does not include exploit code but provides a non-intrusive detection mechanism.

Classification
Scanner 95%
Attack Type
Deserialization
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2019 and Subscription Edition
No auth needed
Prerequisites: Network access to the SharePoint server · Python 3.7 or higher · requests library
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER
by gmh5225 · poc
https://github.com/gmh5225/ZeroPoint

This PowerShell script scans for indicators of compromise related to CVE-2025-53770 in Microsoft SharePoint Server, including suspicious .aspx files, ULS log entries, and security settings like AMSI and Microsoft Defender. It does not exploit the vulnerability but provides detection and optional mitigation steps.

Classification
Scanner 95%
Attack Type
Other
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (on-premises)
Auth required
Prerequisites: Administrator access to SharePoint Server · PowerShell execution policy bypass
devstral-2 · analyzed Mar 24, 2026 Full analysis →
nomisec SCANNER
by n1chr0x · poc
https://github.com/n1chr0x/ZeroPoint

This PowerShell script scans for indicators of compromise related to CVE-2025-53770 in Microsoft SharePoint Server, including suspicious .aspx files, ULS log entries, and security settings like AMSI and Microsoft Defender. It does not exploit the vulnerability but provides detection and optional mitigation steps.

Classification
Scanner 95%
Attack Type
Other
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server (on-premises)
Auth required
Prerequisites: Administrative access to SharePoint Server · PowerShell execution policy bypass
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WRITEUP
by yosasasutsut · poc
https://github.com/yosasasutsut/Blackash-CVE-2025-53770

This repository provides a detailed technical analysis of CVE-2025-53770, a critical RCE vulnerability in Microsoft SharePoint Server due to insecure deserialization of ViewState data. It includes root cause analysis, exploitation steps, detection methods, and mitigation strategies.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint Server 2016, 2019, and Subscription Edition
No auth needed
Prerequisites: Access to SharePoint Server · Ability to upload crafted .aspx files · Stolen ASP.NET machineKey
devstral-2 · analyzed Feb 19, 2026 Full analysis →
metasploit WORKING POC EXCELLENT
by Viettel Cyber Security, sfewer-r7 · rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_toolpane_rce.rb

This Metasploit module exploits a chain of vulnerabilities (CVE-2025-49704, CVE-2025-49706, CVE-2025-53771) in Microsoft SharePoint Server to achieve unauthenticated remote code execution via unsafe deserialization and authentication bypass. It uses a crafted gadget chain involving DataSet, LosFormatter, and TypeConfuseDelegate to execute arbitrary commands.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Microsoft SharePoint Server (2019, 2016, Subscription Edition, 2013, 2010)
No auth needed
Prerequisites: Network access to SharePoint Server · Vulnerable SharePoint version (unpatched)
devstral-2 · analyzed Jun 05, 2026 Full analysis →
patchapalooza WORKING POC
by GreenForceNetwork · remote
https://github.com/GreenForceNetwork/Toolshell_CVE-2025-53770

This repository contains a functional exploit for CVE-2025-53770, targeting SharePoint via ViewState manipulation to upload a webshell and achieve remote code execution (RCE). The exploit leverages crafted __VIEWSTATE, __VIEWSTATEGENERATOR, and __EVENTVALIDATION parameters to bypass validation and deploy a malicious ASPX shell.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SharePoint (version not specified)
Auth required
Prerequisites: Access to SharePoint page source to extract __VIEWSTATE, __VIEWSTATEGENERATOR, and __EVENTVALIDATION · Valid credentials or session to interact with SharePoint
devstral-2 · analyzed Feb 23, 2026 Full analysis →

Nuclei Templates (1)

Microsoft SharePoint Server - Remote Code Execution (ToolShell)
CRITICALVERIFIEDby _l0gg,SamIntruder,sfewer-r7,iamnoooob,pdresearch
Shodan: http.component:"sharepoint"

References (13)

Core 13
Core References
Exploit, Mitigation, Third Party Advisory
https://research.eye.security/sharepoint-under-siege/

Scores

CVSS v3 9.8
EPSS 0.8818
EPSS Percentile 99.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable yes
Technical Impact total

Details

CISA KEV 2025-07-20
VulnCheck KEV 2025-07-18
ENISA EUVD EUVD-2025-23309
Ransomware Use Confirmed
CWE
CWE-502
Status published
Products (3)
microsoft/sharepoint_server 2016
microsoft/sharepoint_server 2019
microsoft/sharepoint_server < 16.0.18526.20508
Published Jul 20, 2025
KEV Added Jul 20, 2025
Tracked Since Feb 18, 2026