CVE-2026-84651 Missing authorization in Jenkins
Attackers with limited agent configuration permissions can overwrite other agents' configurations, gaining control and accessing sensitive secrets.
- 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-2026-84651?
CVE-2026-84651 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 REST API and CLI endpoints for updating agent configuration do not prevent a submitted configuration from overwriting a different agent by specifying that agent's name in the submitted XML document, allowing attackers with Agent/Configure permission on one agent to take over a different agent, gaining control of its configuration and obtaining access to its inbound agent secret and environment variables.
Weakness: CWE-284
Which versions are affected by CVE-2026-84651?
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-2026-84651?
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-2026-84651 being exploited?
There is no known exploitation of CVE-2026-84651 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-2026-84651, GHSA-j4r9-h92x-jjh3, MINI-75j7-p2gq-pqjj, MINI-7xvw-fv3x-993j, MINI-9h8f-5grj-49gv, MINI-f5h8-8v46-w6h7 and 3 more.