CVE-2026-8633: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities when using when using Web Server Plug-ins

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-26 · updated 2026-07-23
Weakness: CWE-94

Description

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 through 8.5.5.29; from 9.0.0.0 through 9.0.5.27

References

https://www.ibm.com/support/pages/node/7274072

Get alerted when CVE-2026-8633 or the next vulnerability affects your stack