CVE-2026-3621: IBM WebSphere Application Server

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.4 IBM WebSphere Application Server Liberty is vulnerable to identity spoofing under limited conditions when an application is deployed without authentication and authorization configured.

Affected products

• IBM WebSphere Application Server: from 17.0.0.3, before 26.0.0.5 (fixed in 26.0.0.5)

Published 2026-04-23. Last modified 2026-06-17.