PatchSiren cyber security CVE debrief

CVE-2026-53441 Jenkins Project CVE debrief

CVE-2026-53441 is a stored cross-site scripting (XSS) vulnerability in Jenkins 2.483 through 2.567 and LTS 2.492.1 through 2.555.2. The vulnerability occurs because Jenkins does not escape the user-provided description of a generic offline cause that could be set through the `POST config.xml` API. This allows attackers with Agent/Configure permission to exploit the vulnerability.

Vendor: Jenkins Project
Product: Jenkins
CVSS: Unknown
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-10
Original CVE updated: 2026-06-10
Advisory published: 2026-06-10
Advisory updated: 2026-06-10

Who should care

Users of Jenkins 2.483 through 2.567 and LTS 2.492.1 through 2.555.2, particularly those with Agent/Configure permission.

Technical summary

The vulnerability is caused by a lack of input validation and sanitization in Jenkins. Specifically, the user-provided description of a generic offline cause is not escaped, allowing an attacker to inject malicious JavaScript code. This code can then be executed by other users who view the description, potentially leading to unauthorized actions or data theft.

Defensive priority

High

Recommended defensive actions

Update Jenkins to a version that fixes the vulnerability.
Restrict access to the `POST config.xml` API to prevent unauthorized users from setting malicious descriptions.
Monitor Jenkins instances for suspicious activity.

Evidence notes

The CVE record and NVD detail provide evidence of the vulnerability. The Jenkins security advisory provides additional information on the vulnerability and the fix.

Official resources

CVE-2026-53441 was published on 2026-06-10T14:16:37.087Z and modified on 2026-06-10T19:43:28.857Z.