CVE-2026-8620: IBM WebSphere Application Server

High severity, CVSS 7.5. EPSS: 0.4% 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 HTTP request smuggling in the Web Server Plug-ins through a specially crafted request.

Affected products

• IBM WebSphere Application Server: from 8.5.0.0, before 8.5.5.30 (fixed in 8.5.5.30); from 9.0.0.0, before 9.0.5.28 (fixed in 9.0.5.28)

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