CVE-2026-27099: Jenkins

High severity, CVSS 8.0. EPSS: 0.6% chance of exploitation in the next 30 days.

Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.

Affected products

• Jenkins Jenkins: from 2.483, before 2.551 (fixed in 2.551); from 2.492.1, before 2.541.2 (fixed in 2.541.2)

Published 2026-02-18. Last modified 2026-06-17.