CVEvulnerability
CVE-2026-18203
6.5 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-31
- Last modified
- 2026-08-07
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-863
Description
A flaw was found in the group policy evaluation logic of Keycloak, an identity and access management solution. When a group policy is set to extend permissions to child groups, the system incorrectly uses a simple text-based prefix check to verify group membership. This allows a user who belongs to a different group with a similar starting name to bypass security checks and gain unauthorized access to administrative functions or protected resources.
Affected configurations
• redhat build of keycloak
Related
Weakness · CWE (1)
- CWE-863 Incorrect Authorization weakness
References
- https://access.redhat.com/security/cve/CVE-2026-18203 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2508291 Issue Tracking, Vendor Advisory