Quick answers
- Is CVE-2026-11548 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-11548 being exploited in the wild.
- How severe is CVE-2026-11548?
- Medium severity, with a CVSS score of 4.8, published 18 September 2026.
- Which products and versions are affected?
- IBM WebSphere Application Server <UNKNOWN>; IBM WebSphere Application Server Liberty <UNKNOWN>.
- Is there a fix for CVE-2026-11548?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-11548 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-11548?
- Check whether you run IBM WebSphere Application Server or IBM WebSphere Application Server Liberty at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
HTTP request smuggling occurs when the application server inconsistently parses malformed or ambiguous HTTP requests, allowing attackers to inject hidden requests that the server processes differently than intended. This can lead to request processing confusion, cache poisoning, or authentication bypass. The vulnerability affects both the full WebSphere Application Server product and the lightweight Liberty variant.
Affected products
- IBM WebSphere Application Server <UNKNOWN>
- IBM WebSphere Application Server Liberty <UNKNOWN>
Timeline
- 2026-09-18: disclosed