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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
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-07-06
Advisory published
2026-06-10
Advisory updated
2026-07-06

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53441 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53441

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53441 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53441

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.