CVE-2026-74909 Missing authorization in Red Hat Single Sign-On 7
An authenticated user can bypass Keycloak policy enforcer restrictions using percent-encoded URI segments to access unauthorized administrative or private endpoints.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74909?
CVE-2026-74909 is a high-severity missing authorization vulnerability in Red Hat Single Sign-On 7, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies. A flaw was found where the enforcer fails to correctly normalize web addresses that contain special encoded characters, such as those representing semicolons or directory traversal segments. An authenticated user can use these encoded characters to trick the enforcer into applying a less restrictive security policy than intended, potentially gaining unauthorized access to sensitive administrative or private application endpoints.
Weakness: CWE-862
Which versions are affected by CVE-2026-74909?
How do I fix CVE-2026-74909?
No fix has been published for CVE-2026-74909 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-74909 being exploited?
There is no known exploitation of CVE-2026-74909 in the wild and no public exploit code.
Sources
Also known as GHSA-5639-qg9x-rw29.