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 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.

• CWE-639
• CWE-639

• https://access.redhat.com/errata/RHSA-2026:30049Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30050Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30083Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30084Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2026-9099Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2480182Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30049Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30050Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30083Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30084Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2026-9099Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2480182Third Party Advisory
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9099.jsonThird Party Advisory

Published

Jun 25, 2026

Last Modified

Jul 15, 2026

Status

Analyzed

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