CVE-2021-21671: Jenkins

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.

Affected products

• Jenkins Jenkins: from 2.266, before 2.300 (fixed in 2.300); from 2.277.1, before 2.289.2 (fixed in 2.289.2)

Published 2021-06-30. Last modified 2026-06-17.