Jenkins: Stored XSS vulnerability in node offline cause description
Date: 2026-06
Affected: maven/org.jenkins-ci.main:jenkins-core
Attack vector: xss
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-53441
CWE: CWE-79
CVSS: 8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H)

Jenkins 2.483 through 2.567 (both inclusive), LTS 2.492.1 through 2.555.2 (both inclusive) does not escape the user-provided description of a generic offline cause that could be set through the `POST config.xml` API, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure permission.


Mitigations:

Architectural layers (MAESTRO):