SEPTEMBER 17, 2026
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Case File

CVE-2026-85238

MEDIUM · CVSS 6.8 EPSS 0.22% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-03 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

MISP is vulnerable to a session fixation attack in its CustomAuth authentication flow, allowing an attacker to exploit a known session identifier to hijack a victim's authenticated session. This could enable unauthorized access to the victim's account and associated privileges. Organizations using MISP should prioritize applying the patch to mitigate this high-severity vulnerability and protect user sessions from potential exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-85238
Severity
MEDIUM
CVSS
6.8
EPSS
0.22%

Original NVD Description

MISP contains a session fixation vulnerability in the CustomAuth authentication (a custom configuration) flow. When a user was successfully authenticated through CustomAuth, MISP stored the authenticated user identity in the existing session without first rotating the session identifier. As a result, if an attacker can cause a victim to use a session identifier known to the attacker before authentication, that same session identifier remains valid after the victim successfully authenticates. The attacker could subsequently reuse the fixed session identifier to access the victim's authenticated MISP session, potentially gaining the privileges associated with the victim's account. The issue occurs because __customAuthentication() wrote the authenticated user into the existing CakePHP session while the call to Session->renew() had previously been disabled. The patch restores session identifier rotation when a new authentication occurs or when the authenticated user changes, while avoiding unnecessary session renewal on every request.

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