What is CVE-2026-84661?

CVE-2026-84661 is a medium-severity vulnerability in Jenkins Project Pipeline: Build Step Plugin, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-09-02.

How severe is CVE-2026-84661?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Jenkins Project Pipeline: Build Step Plugin

CVE-2026-84661

A missing permission check in Jenkins Pipeline: Build Step Plugin 599.v4b_67ea_11b_152 and earlier causes downstream builds awaited by the `waitForBuild` step when the `propagateAbort` parameter is used to be canceled even when the build's authentication lacks Item/Cancel permission on the downstream job.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

Affected products

Jenkins Project Pipeline: Build Step Plugin

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

jenkinsci-cert@googlegroups.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-84661?: CVE-2026-84661 is a medium-severity vulnerability in Jenkins Project Pipeline: Build Step Plugin, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-09-02.
How severe is CVE-2026-84661?: Medium severity. CVSS v3 base score is 5.4 out of 10.