Description (CNA)
A flaw was found in Keycloak. This improper input validation vulnerability occurs because Keycloak accepts RFC-compliant matrix parameters in URL path segments, while common reverse proxy configurations may ignore or mishandle them. A remote attacker can craft requests to mask path segments, potentially bypassing proxy-level path filtering. This could expose administrative or sensitive endpoints that operators believe are not externally reachable.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat build of Keycloak 26.4.9 | unaffected |
| Red Hat / Red Hat Build of Keycloak | affected |
| Red Hat / Red Hat JBoss Enterprise Application Platform 8 | affected |
| Red Hat / Red Hat JBoss Enterprise Application Platform 8 | affected |
| Red Hat / Red Hat JBoss Enterprise Application Platform 8 | affected |
| Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack | affected |
| Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack | affected |
| Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack | affected |
CWE
CWE-20
References
- https://access.redhat.com/errata/RHSA-2026:2365
- https://access.redhat.com/security/cve/CVE-2026-0976
- https://bugzilla.redhat.com/show_bug.cgi?id=2429869
ADP enrichment
No English description supplied.
No references supplied.