Session fixation vulnerability in Jenkins Keycloak Authentication Plugin

published 2023-01-24 3 y ago modified 2026-06-17 4 mo ago also GHSA-9963-gmh8-vvm6 , EUVD-2023-0427

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits: 0; none known

Jenkins Keycloak Authentication Plugin 2.3.0 and earlier does not invalidate the previous session on login.

Patch / fix

fixed in 1 links 1

maven org.jenkins-ci.plugins:keycloak 2.3.1

github.com/jenkinsci/keycloak-plugin@11ae476 commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 19 mo ago (2025-04-02)

Exploit prediction

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.jenkins-ci.plugins:keycloak	<2.3.1	2.3.1

Affected products

Jenkins Project Jenkins Keycloak Authentication Plugin

Classification

Weakness

CWE-384 Session Fixation

References

github.com /jenkinsci/keycloak-plugin/commit/11ae47695dc7c60f6681214aecde2833e050febb
web
jenkins.io /security/advisory/2023-01-24/#SECURITY-2987
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2023-24456
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