Review reviewCritical

CVE-2026-8633

IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty, websphere application server

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.

CVSS: 9.8
EPSS: -
CISA KEV: Not listed
Published: 2026.05.27

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty, websphere application server
Affected versions: >= 8.5, 9.0, >= 8.5.0.0 <= 8.5.5.29, >= 9.0.0.0 <= 9.0.5.27
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty, websphere application server and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-94