CVE-2026-84661 Missing authorization in Jenkins Pipeline: Build Step Plugin
Attackers can cancel downstream Jenkins builds without Item/Cancel permission when using the propagateAbort parameter in the Build Step Plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84661?
CVE-2026-84661 is a medium-severity missing authorization vulnerability in Jenkins Pipeline: Build Step Plugin, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-84661?
How do I fix CVE-2026-84661?
No fix has been published for CVE-2026-84661 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84661 being exploited?
There is no known exploitation of CVE-2026-84661 in the wild and no public exploit code.
Sources
Also known as GHSA-w3m3-g5p2-2prv.