EUVD-2026-39472
GHSA-rmcj-82cr-27rx
Severity by source
AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
Network-reachable Admin REST API (AV:N) but needs existing delegated group-admin rights and FGAPv2 (PR:H, AC:H); cross-authority realm takeover yields S:C with full C/I/A impact.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
Lifecycle Timeline
1DescriptionCVE.org
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.
AnalysisAI
Privilege escalation in Keycloak (Red Hat Build of Keycloak) lets an authenticated delegated admin with management rights over a single low-privilege group hijack the entire realm. A missing authorization check in the Admin REST API's GroupResource.addChild() endpoint allows reparenting an arbitrary group; when Fine-Grained Admin Permissions v2 (FGAPv2) is enabled, an attacker can move a privileged group (e.g., one holding realm-admin) under a group they control, inheriting management and password-reset rights over its members. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) Keycloak configured with Fine-Grained Admin Permissions v2 (FGAPv2) enabled, (2) an authenticated account that already holds management (manage) rights over at least one group (a limited delegated administrator), and (3) the existence of a more privileged target group such as one possessing the realm-admin role; the attacker then invokes the Admin REST API GroupResource.addChild() endpoint to reparent that privileged group under their managed group. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals point to a high-impact-but-constrained issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | In a Keycloak realm using FGAPv2, an attacker holds a delegated-admin account with manage rights over only one low-privilege group (for example a tenant or team group). Using the Admin REST API addChild() call they reparent the realm-admin-bearing group under their managed group, inheriting management and password-reset authority over its members, then reset an administrator's password and take over the realm. … |
| Remediation | No vendor-released patch version was identified at time of analysis from the provided data; consult the Red Hat advisory (https://access.redhat.com/security/cve/CVE-2026-9099) and Bugzilla 2480182 (https://bugzilla.redhat.com/show_bug.cgi?id=2480182) for the fixed build and apply it as the primary remediation once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 HOURS: Determine whether Fine-Grained Admin Permissions v2 is active in production Keycloak deployments and inventory all users with delegated group administration privileges. …
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