HTTP Request Smuggling Vulnerability in IBM WebSphere Application Server
CVE-2026-11548

4.8MEDIUM

Key Information:

Vendor

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

What is CVE-2026-11548?

IBM WebSphere Application Server and WebSphere Application Server Liberty are susceptible to an HTTP request smuggling vulnerability that can allow attackers to exploit the application’s handling of requests. This flaw enables unauthorized data manipulation and access, potentially compromising the integrity and confidentiality of sensitive information transmitted between the client and server. Prompt updates and security patches are recommended to safeguard against potential exploits.

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:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.