CVE-2021-21621: Jenkins Support Core

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Jenkins Support Core Plugin 2.72 and earlier provides the serialized user authentication as part of the "About user (basic authentication details only)" information, which can include the session ID of the user creating the support bundle in some configurations.

Affected products

• Jenkins Support Core: up to and including 2.72

Published 2021-02-24. Last modified 2026-06-17.