Session Fixation in Jenkins and Jenkins LTS - CVE-2026-84652
Published: September 4, 2026
Vulnerability identifier: #VU146905
CSH Severity: High
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84652
CWE-ID: CWE-384
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the session fixation issue in the "remember me" cookie. A remote attacker can set a known session cookie before the victim logs in and hijack a victim's authenticated Jenkins session.
Affected software
Jenkins
Jenkins LTS
Jenkins LTS
How to mitigate CVE-2026-84652
Install updates from vendor's website.
Jenkins - update to 2.580
Jenkins LTS - update to 2.568.3
Jenkins LTS - update to 2.568.3