GHSA-85h6-5m3v-gx37

Jenkins has a stored XSS vulnerability in node offline cause description

Source: GitHub Advisory Database (reviewed) High CVE-2026-27099

Packages

Ecosystem	Package	Affected	Fixed in
Maven	org.jenkins-ci.main:jenkins-core	>= 2.542, < 2.551	2.551
Maven	org.jenkins-ci.main:jenkins-core	>= 2.483, < 2.541.2	2.541.2

Details

As written in the advisory (Markdown source, shown as plain text).

Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2026-27099 advisory
https://github.com/jenkinsci/jenkins/commit/578c028e2cdfdc9e124d0ca389a80bb2bd231ab2 web
https://github.com/jenkinsci/jenkins package
https://github.com/jenkinsci/jenkins/releases/tag/jenkins-2.541.2 web
https://github.com/jenkinsci/jenkins/releases/tag/jenkins-2.551 web
https://www.jenkins.io/security/advisory/2026-02-18/#SECURITY-3669 web