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CVE-2026-9099

Keycloak: group-admin escalation to realm-admin PUBLISHED

Description (CNA)

A flaw was found in Keycloak. A missing authorization check in the GroupResource.addChild() endpoint within the Admin REST API allows an authenticated user with limited administrative privileges to reparent any existing group. When Fine-Grained Admin Permissions v2 (FGAPv2) is enabled, an attacker with management rights over a single low-privilege group can reparent a highly privileged group (such as one possessing the realm-admin role) under their managed group. Because group permissions follow a hierarchical structure, this action unauthorizedly grants the attacker management and password-reset capabilities over the members of the targeted privileged group. An attacker can exploit this to reset an administrator's password, compromise the account, and achieve a full realm takeover, leading to a complete compromise of confidentiality, integrity, and availability.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4.13-1 before *
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4-19 before *
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4-19 before *
Red Hat / Red Hat build of Keycloak 26.4.13unaffected
Red Hat / Red Hat build of Keycloak 26.6unaffected 26.6.4-2 before *
Red Hat / Red Hat build of Keycloak 26.6unaffected 26.6-8 before *
Red Hat / Red Hat build of Keycloak 26.6unaffected 26.6-8 before *
Red Hat / Red Hat build of Keycloak 26.6.4unaffected

CWE

CWE-639

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in Keycloak. A missing authorization check in the GroupResource.addChild() endpoint within the Admin REST API allows an authenticated user with limited administrative privileges to reparent any existing group. When Fine-Grained Admin Permissions v2 (FGAPv2) is enabled, an attacker with management rights over a single low-privilege group can reparent a highly privileged group (such as one possessing the realm-admin role) under their managed group. Because group permissions follow a hierarchical structure, this action unauthorizedly grants the attacker management and password-reset capabilities over the members of the targeted privileged group. An attacker can exploit this to reset an administrator's password, compromise the account, and achieve a full realm takeover, leading to a complete compromise of confidentiality, integrity, and availability.