CVE-2026-8633: IBM WebSphere Application Server

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM WebSphere Application Server and WebSphere Application Server Liberty are vulnerable to remote code execution in the Web Server Plug-ins, through a specially crafted request.

Affected products

• IBM WebSphere Application Server: from 8.5.0.0, up to and including 8.5.5.29; from 9.0.0.0, up to and including 9.0.5.27

Published 2026-05-26. Last modified 2026-07-23.