CVE-2026-11549 IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty Improper Access Control
Attackers can bypass virtual host restrictions in IBM WebSphere Liberty shipped with CICS TX Advanced, requiring vendor patches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11549?
CVE-2026-11549 is a medium-severity vulnerability in IBM WebSphere Application Server, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are affected by a virtual host bypass vulnerability.
Weakness: CWE-284
Which versions are affected by CVE-2026-11549?
How do I fix CVE-2026-11549?
No fix has been published for CVE-2026-11549 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11549 being exploited?
There is no known exploitation of CVE-2026-11549 in the wild and no public exploit code.
Sources
Also known as GHSA-c3g2-rhrj-675h.