CVE-2025-53691

HIGH

Sitecore XP 9.0-9.3, 10.0-10.4 - RCE via Untrusted Deserialization

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 5 public exploits for CVE-2025-53691. PoCs published by blueisbeautiful, brokendreamsclub, fuckyourheroes.

AI-analyzed exploit summary This repository contains a functional exploit chain for Sitecore XP (up to 10.4.1), combining information disclosure (CVE-2025-53694), cache poisoning (CVE-2025-53693), and deserialization-based RCE (CVE-2025-53691). The `chain.py` script orchestrates the full attack, while the `REPORT.md` provides detailed technical analysis.

Description

Deserialization of Untrusted Data vulnerability in Sitecore Experience Manager (XM), Sitecore Experience Platform (XP) allows Remote Code Execution (RCE).This issue affects Experience Manager (XM): from 9.0 through 9.3, from 10.0 through 10.4; Experience Platform (XP): from 9.0 through 9.3, from 10.0 through 10.4.

Exploits (5)

github WORKING POC
by blueisbeautiful · pythonpoc
https://github.com/blueisbeautiful/CVE-2025-53694-to-CVE-2025-53691

This repository contains a functional exploit chain for Sitecore XP (up to 10.4.1), combining information disclosure (CVE-2025-53694), cache poisoning (CVE-2025-53693), and deserialization-based RCE (CVE-2025-53691). The `chain.py` script orchestrates the full attack, while the `REPORT.md` provides detailed technical analysis.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Sitecore Experience Platform (XP) up to 10.4.1
No auth needed
Prerequisites: Target running vulnerable Sitecore XP version · Network access to the Sitecore instance
devstral-2 · analyzed May 17, 2026 Full analysis →
github WORKING POC
by brokendreamsclub · pythonpoc
https://github.com/brokendreamsclub/CVE-2025-53694-to-CVE-2025-53691

This repository contains a functional exploit chain for Sitecore XP, combining information disclosure, cache poisoning, and deserialization-based RCE (CVE-2025-53694, CVE-2025-53693, CVE-2025-53691). The `chain.py` script orchestrates the full attack, while the README and REPORT.md provide detailed technical analysis.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Sitecore Experience Platform (XP) up to 10.4.1
No auth needed
Prerequisites: Network access to Sitecore instance · Unauthenticated access to vulnerable endpoints
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by blueisbeautiful · poc
https://github.com/blueisbeautiful/CVE-2025-53691

This repository contains a functional exploit for CVE-2025-53691, targeting insecure deserialization in Sitecore's `AjaxScriptManager` via the `ProcessSerializedData` method. The exploit uses `BinaryFormatter` deserialization to achieve remote code execution (RCE) and includes both automated payload generation (via ysoserial.net) and manual payload crafting.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Sitecore Experience Platform (XP)
No auth needed
Prerequisites: Access to the target Sitecore instance · Network connectivity to the target · ysoserial.net for automated payload generation (optional)
devstral-2 · analyzed May 12, 2026 Full analysis →
nomisec WORKING POC
by fuckyourheroes · poc
https://github.com/fuckyourheroes/CVE-2025-53691

This repository contains a functional exploit for CVE-2025-53691, targeting insecure deserialization in Sitecore's AjaxScriptManager via the ProcessSerializedData method. The exploit uses ysoserial.net or a manual payload to achieve RCE through BinaryFormatter deserialization.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Sitecore Experience Platform
No auth needed
Prerequisites: Access to a vulnerable Sitecore instance · ysoserial.net for payload generation (optional)
devstral-2 · analyzed May 03, 2026 Full analysis →
nomisec WORKING POC
by brokendreamsclub · poc
https://github.com/brokendreamsclub/CVE-2025-53691

This repository contains a functional exploit for CVE-2025-53691, targeting insecure deserialization in Sitecore's AjaxScriptManager via the ProcessSerializedData method. The exploit uses ysoserial.net or a manual payload to achieve RCE through BinaryFormatter deserialization.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Sitecore Experience Platform
No auth needed
Prerequisites: Access to a vulnerable Sitecore instance · Network connectivity to the target
devstral-2 · analyzed Feb 19, 2026 Full analysis →

Scores

CVSS v3 8.8
EPSS 0.0144
EPSS Percentile 69.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-502
Status published
Products (5)
sitecore/experience_commerce 9.0 - 10.4
sitecore/experience_manager 9.0 - 10.4
sitecore/experience_platform 10.4
sitecore/experience_platform 9.0 - 10.4
sitecore/managed_cloud
Published Sep 03, 2025
Tracked Since Feb 18, 2026