CVE-2026-84661: Jenkins Project Jenkins Pipeline: Build Step Plugin

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Jenkins Project Jenkins Pipeline: Build Step Plugin: up to and including 599.v4b_67ea_11b_152

Published 2026-09-02. Last modified 2026-09-03.