How severe is CVE-2026-8633?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Ibm Web Server Plug-ins For Websphere Application And Liberty

CVE-2026-8633

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…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (49.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Web Server Plug-ins For Websphere Application And Liberty — versions 8.5, 9.0
Ibm Websphere_application_server — versions 8.5, 9.0.0.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

psirt@us.ibm.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8633?: CVE-2026-8633 is a critical-severity vulnerability in Ibm Web Server Plug-ins For Websphere Application And Liberty, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-26.
How severe is CVE-2026-8633?: Critical severity. CVSS v3 base score is 9.8 out of 10.