CVE-2026-9099

[CVE catalog]

Severity

High · CVSS 7.7CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N

Published

Jun 25, 2026, 3:58:51 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.49% · Oct 25, 2026

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. keycloak: Group-Admin Escalation to Realm-Admin This vulnerability is rated as High impact. When Fine-Grained Admin Permissions (FGAPv2) are enabled in Keycloak, a delegated administrator with specific `manage-members` permissions on a low-privilege group can bypass authorization checks to reparent any other group, including those with `realm-admin` roles. This allows the attacker to reset passwords of members in the stolen group, leading to a full realm takeover. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.