HTTP Req Smuggling in IBM WebSphere WSAS 8.5/9.0 & Liberty 17.0.0.3-26.0.0.6
CVE-2026-11541 Published on June 30, 2026
Inconsistent Interpretation of HTTP Requests in CICS Transaction Gateway for Multiplatforms.
IBM CICS Transaction Gateway for Multiplatforms 9.1, 9.2, 9.3, and 10.1 IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are affected by an HTTP request smuggling vulnerability.
Vulnerability Analysis
CVE-2026-11541 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2026-11541 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-11541
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Affected Versions
IBM CICS Transaction Gateway for Multiplatforms:- Version 9.1 is affected.
- Version 9.2 is affected.
- Version 9.3 is affected.
- Version 10.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.