CVE-2026-84657 Missing authorization in Jenkins
Attackers with build permissions can cancel other users' builds via CLI due to missing permission checks, requiring an upgrade to Jenkins.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84657?
CVE-2026-84657 is a medium-severity missing authorization vulnerability in Jenkins Jenkins, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the build CLI command does not check the Item/Cancel permission when using the -s flag to cancel a build triggered to wait for completion, allowing attackers with Item/Build permission to cancel builds started by other users.
Weakness: CWE-862
Which versions are affected by CVE-2026-84657?
1 open source package ship an affected version, including jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
jenkins Bitnami | All versions | 2.568.3, 2.580.0 |
Products include Jenkins Jenkins.
How do I fix CVE-2026-84657?
Upgrade jenkins to a fixed version for your release line: 2.568.3 or 2.580.0.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84657 being exploited?
There is no known exploitation of CVE-2026-84657 in the wild and no public exploit code.
Other vulnerabilities in Jenkins Jenkins
- CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal
- CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data
- CVE-2017-1000353 Jenkins Remote Code Execution
- CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure
- CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
Sources
Also known as BIT-jenkins-2026-84657, GHSA-c5q4-vhqv-p6fj, MINI-4vx5-frxh-mjmf, MINI-599j-gwfq-xff2, MINI-5q5v-2vw8-hhf8, MINI-mhq8-m296-33f8 and 3 more.