AIKIDO-2026-163590
jenkins-core is vulnerable to Session Fixation
88
High Risk
This Affects:
jenkins-coreTL;DR
Authentication through the "remember me" cookie does not rotate the existing session. An attacker who can set a known session cookie on the same site can have that session become authenticated when the victim is re-authenticated from the persistent cookie. The fix invalidates and rotates the existing session when authenticating via the remember-me cookie.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and attackers can serve content on the same site as Jenkins to set a victim session cookie.
Background info
jenkins-core is vulnerable to Session Fixation in versions 0.0.1 - 2.568.2 and 2.569 - 2.579.
How to fix this
Upgrade the org.jenkins-ci.main:jenkins-core library to the patch version.
Are You Affected?
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