CVE-2026-84651: Jenkins Jenkins vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker needs Agent/Configure permission on at least one Jenkins agent. They can then submit XML naming a different agent and overwrite that other agent's configuration.
What could an attacker obtain or control?
The attacker can take over another agent's configuration. This can expose that agent's inbound agent secret and environment variables.
Which Jenkins versions are affected?
Jenkins 2.579 and earlier, and Jenkins LTS 2.568.2 and earlier, are affected.