Jenkins CAS Plugin Session Fixation vulnerability

published 2023-05-16 3 y ago modified 2026-06-17 4 mo ago also GHSA-hjh8-9gxh-cx4x , EUVD-2023-1559

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

Jenkins CAS Plugin 1.6.2 and earlier does not invalidate the previous session on login.

Patch / fix

fixed in 1 links 1

maven org.jenkins-ci.plugins:cas-plugin 1.6.3

github.com/jenkinsci/cas-plugin@3a33cc0 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 21 mo ago (2025-01-23)

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.jenkins-ci.plugins:cas-plugin	<1.6.3	1.6.3

Affected products

Jenkins Project Jenkins CAS Plugin

Classification

Weakness

CWE-384 Session Fixation

References

github.com /jenkinsci/cas-plugin/commit/3a33cc0175bcc18801faf9125afb38d495b5995f
web
jenkins.io /security/advisory/2023-05-16/#SECURITY-3000
vendor-advisory, web
nvd.nist.gov /vuln/detail/CVE-2023-32997
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary