Privilege Escalation Vulnerability in Keycloak by Red Hat
CVE-2026-9796
6.5MEDIUM
What is CVE-2026-9796?
A Time-of-check to time-of-use (TOCTOU) vulnerability exists in Keycloak that allows an authenticated administrator with the manage-clients role to exploit name-based admin role checks. This flaw enables the attacker to escalate their privileges to realm-admin, resulting in comprehensive control over all users within the realm. Notably, the composite role relationship remains effective even if the attacker's own permissions are subsequently revoked, and it persists across system reboots, presenting significant security risks for affected installations.
References
CVSS V3.1
Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged
Timeline
Vulnerability published
Vulnerability Reserved
Credit
Red Hat would like to thank Daniel Peters (Operating Intelligence Inc.), Lior Moshe (Operating Intelligence Inc.), and Uri Rolls (Operating Intelligence Inc.) for reporting this issue.