CVE-2026-9099

published 2026-06-25

CVE-2026-9099: A flaw was found in Keycloak. A missing authorization check in the GroupResource.addChild() endpoint within the Admin REST API allows an authenticated user…

Priority P3 51 high 7.7 CVSS 3.1

AV N AC H PR H UI N S C C H I H A N

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

6 ranges

Vendor	Product	Version range	Fixed in
redhat	build_of_keycloak	>= 26.4 < 26.4.13	26.4.13
redhat	build_of_keycloak	>= 26.6 < 26.6.4	26.6.4
rhbk	keycloak-operator-bundle_26.6.4-2	—	—
rhbk	keycloak-rhel9	—	—
rhbk	keycloak-rhel9-operator_26.6-8	—	—
rhbk	keycloak-rhel9_26.6-8	—	—

CVSS provenance

nvd v3.1 7.7 HIGH CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N

vendor_redhat 7.7 HIGH

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CWE-639