CVE-2026-84651

Medium

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.

SeverityMedium

CVSS6.3

Exploit probability—

Product

Jenkins

PublishedSep 2, 2026

First seenSep 2, 2026

Weakness typeCWE-284Improper access control

How to fix

Update

jenkins jenkins2.568.3, 2.580 or later

Vendor advisories

jenkins.io/security/advisory/2026-09-02/#SECURITY-4025

Affected products

Product	Affected versions	Fixed in
jenkins jenkins	v < 2.568.3, v < 2.580	2.568.3, 2.580

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