Jenkins API Agent Config Overwrite CVE-2026-84651 (2.579, 2.568.2)
CVE-2026-84651 Published on September 2, 2026
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.
Vulnerability Analysis
CVE-2026-84651 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2026-84651 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2026-84651
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Affected Versions
Jenkins Project Jenkins:- Version 2.580 and below * is unaffected.
- Version 2.568.3 and below 2.568.* is unaffected.