Jenkins Session Fixation via RememberMe Cookie (up to 2.579)
CVE-2026-84652 Published on September 2, 2026
In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, Jenkins does not rotate the session when a user is authenticated via the "remember me" cookie, allowing attackers able to serve content on the same site as Jenkins to set a known session cookie in the victim's browser, which after the victim authenticates via the "remember me" cookie, grants the attacker access to Jenkins as that user.
Vulnerability Analysis
CVE-2026-84652 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
Session Fixation
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
Products Associated with CVE-2026-84652
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Affected Versions
Jenkins Project Jenkins:- Version 2.580 and below * is unaffected.
- Version 2.568.3 and below 2.568.* is unaffected.