CVE-2026-84648: Jenkins

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in control of agent processes.

Affected products

• Jenkins Jenkins: before 2.568.3 (fixed in 2.568.3); before 2.580 (fixed in 2.580)

Published 2026-09-02. Last modified 2026-09-11.