CVE-2026-9330: IBM WebSphere Application Server

High severity, CVSS 8.5. EPSS: 0.7% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 9.0, and 8.5 is affected by an improper validation of user-supplied data during deserialization using the SAML Web Single Sign-On component. This could result in remote code execution via a crafted HTTP request when combined with a suitable gadget chain.

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 9.0.5.29 (fixed in 9.0.5.29)

Published 2026-06-01. Last modified 2026-07-22.