A flaw was found in the Keycloak identity and access management system when Fine-Grained Admin Permissions(FGAPv2) are enabled. An administrative user with the manage-users role can escalate their privileges to realm-admin due to improper privilege enforcement. This vulnerability allows unauthorized elevation of access rights, compromising the intended separation of administrative duties and posing a security risk to the realm.

Affected: Maven: org.keycloak:keycloak-services

A Privilege Escalation vulnerability was identified in the Keycloak identity and access management solution, specifically when FGAPv2 is enabled in version 26.2.x. The flaw lies in the admin permission enforcement logic, where a user with manage-users privileges can self-assign realm-admin rights. The escalation occurs due to missing privilege boundary checks in role mapping operations via the admin REST interface. A malicious administrator with limited permissions can exploit this by editing their own user roles, gaining unauthorized full access to realm configuration and user data.

This issue has been fixed in versions 26.2.6, and 26.3.0.

keycloak: Phishing attack via email verification step in first login flow org.keycloak/keycloak-services: Privilege Escalation in Keycloak Admin Console (FGAPv2 Enabled)

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Keycloak ausnutzen, um seine Privilegien zu erhöhen.