What is CVE-2026-84651?

CVE-2026-84651 is a medium-severity vulnerability, classified under Improper Access Control. CVSS score: 6.3/10. Published 2026-09-02.

How severe is CVE-2026-84651?

Medium severity. CVSS v3 base score is 6.3 out of 10.

CVE-2026-84651

CVE-2026-84651

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.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

jenkinsci-cert@googlegroups.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-84651?: CVE-2026-84651 is a medium-severity vulnerability, classified under Improper Access Control. CVSS score: 6.3/10. Published 2026-09-02.
How severe is CVE-2026-84651?: Medium severity. CVSS v3 base score is 6.3 out of 10.