Virtual Host Bypass Vulnerability in IBM WebSphere Application Server
CVE-2026-11549

6.5MEDIUM

Key Information:

Vendor

IBM
Status
Websphere Application Server
Websphere Application Server - Liberty
Vendor
CVE Published:
18 September 2026

What is CVE-2026-11549?

IBM WebSphere Application Server and WebSphere Application Server Liberty are susceptible to a virtual host bypass vulnerability, which may allow unauthorized access to resources or services that should be restricted. This issue highlights the importance of proper configuration and security measures to protect web applications and their underlying infrastructure.

Affected Version(s)

WebSphere Application Server 9.0

WebSphere Application Server 8.5

WebSphere Application Server - Liberty 17.0.0.3 <= 26.0.0.5

References

https://www.ibm.com/support/pages/node/7286610
vendor-advisorypatch
https://www.ibm.com/support/pages/node/7286611
vendor-advisorypatch

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.