CVE-2026-0300
CRITICAL KEVPalo Alto PAN-OS User-ID Authentication Portal - Unauthenticated Root RCE
Title source: manualExploitation Summary
CVE-2026-0300 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added May 6, 2026. EIP tracks 13 public exploits from researchers including adminlove520, qassam-315, p3Nt3st3r-sTAr.
AI-analyzed exploit summary The repository contains a functional Python-based PoC for CVE-2026-0300, a critical buffer overflow vulnerability in PAN-OS User-ID Portal. The exploit demonstrates an out-of-bounds write leading to potential RCE via a crafted POST request.
Description
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
Exploits (13)
The repository contains a functional Python-based PoC for CVE-2026-0300, a critical buffer overflow vulnerability in PAN-OS User-ID Portal. The exploit demonstrates an out-of-bounds write leading to potential RCE via a crafted POST request.
This repository contains a functional Python-based proof-of-concept exploit for CVE-2026-0300, a buffer overflow vulnerability in Palo Alto Networks PAN-OS User-ID Authentication Portal. The exploit demonstrates remote code execution by sending a crafted POST request to overflow a fixed-size buffer, potentially allowing control over the instruction pointer.
This repository contains a functional Python-based exploit for CVE-2026-0300, a critical buffer overflow vulnerability in Palo Alto Networks PAN-OS User-ID™ Authentication Portal. The exploit leverages a crafted POST request to trigger an out-of-bounds write, leading to remote code execution via a reverse shell payload.
This repository contains a functional honeypot for CVE-2026-0300, designed to emulate the PAN-OS User-ID Authentication Portal vulnerability. The honeypot script (`pan_userid_honeypot.py`) is deployed via an installer script that sets up a Python-based service to monitor and log exploitation attempts on ports 6080/6081/6082.
The repository contains a Python script that scans for potentially vulnerable Palo Alto Networks PAN-OS endpoints associated with CVE-2026-0300, a buffer overflow vulnerability in the User-ID Authentication Portal (Captive Portal) service. It checks for accessible endpoints but does not include exploit code for achieving RCE.
This repository contains a functional exploit for CVE-2026-0300, targeting a memory corruption vulnerability in a PHP-based application. The exploit constructs a malicious HTTP POST request with a buffer overflow payload to achieve remote code execution via a reverse shell.
This repository contains a functional exploit for CVE-2026-0300, a buffer overflow vulnerability in PAN-OS User-ID Portal leading to remote code execution. The PoC constructs a malicious POST request with a reverse shell payload and sends it to the target.
The repository claims to be a PoC for CVE-2026-0300 but lacks actual exploit code, instead redirecting users to an external link (tinyurl.com). The README is vague and lacks technical details about the vulnerability.
This repository contains a non-destructive exposure survey tool for CVE-2026-0300, which is a buffer overflow vulnerability in Palo Alto Networks PAN-OS User-ID Authentication Portal. The tool checks for network and HTTP(S) reachability, portal-related paths, and basic response fingerprints to assess exposure without exploiting the vulnerability.
The repository contains a functional Python-based proof-of-concept exploit for CVE-2026-0300, targeting an unauthenticated remote code execution vulnerability in Palo Alto Networks PAN-OS User-ID Portal. The exploit crafts a malicious HTTP POST request with a buffer overflow payload to achieve RCE.
This repository provides read-only audit tooling for CVE-2026-0300, an unauthenticated buffer overflow in the PAN-OS User-ID Authentication Portal. The scripts query the PAN-OS XML API to detect configurations vulnerable to the CVE but do not exploit it.
The repository contains a Python script that scans for exposed Palo Alto PAN-OS Captive Portal endpoints vulnerable to CVE-2026-0300, a critical buffer overflow vulnerability. It checks multiple paths and reports if any are accessible, but does not include exploit code.
References (3)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H