Keycloak: group-admin escalation to realm-admin
Summary
| CVE | CVE-2026-9099 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-25 17:17:03 UTC |
| Updated | 2026-07-15 01:17:08 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.7 HIGH from ADP
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
EPSS: 0.002880000 probability, percentile 0.206300000 (date 2026-07-04)
Problem Types: CWE-639 | CWE-639 Authorization Bypass Through User-Controlled Key
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7.7 | HIGH | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N |
| 3.1 | [email protected] | Secondary | 7.7 | HIGH | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.7 | HIGH | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 7.7 | HIGH | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Redhat | Build Of Keycloak | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4.13-1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-19 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-19 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4.13 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.6 | unaffected 26.6.4-2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.6 | unaffected 26.6-8 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.6 | unaffected 26.6-8 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.6.4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4.13-1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-19 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-19 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4.13 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.6 | unaffected 26.6.4-2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.6 | unaffected 26.6-8 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.6 | unaffected 26.6-8 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.6.4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:30084 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/security/cve/CVE-2026-9099 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9099.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | Third Party Advisory |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:30050 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:30083 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:30049 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-05-20T15:05:54.381Z | Reported to Red Hat. |
| CNA | 2026-06-25T15:58:51.884Z | Made public. |
| ADP | 2026-05-20T15:05:54.381Z | Reported to Red Hat. |
| ADP | 2026-06-25T15:58:51.884Z | Made public. |
Solutions
ADP: RHSA-2026:30050: Red Hat build of Keycloak 26.4
ADP: RHSA-2026:30084: Red Hat build of Keycloak 26.6
ADP: RHSA-2026:30049: Red Hat build of Keycloak 26.4.13
ADP: RHSA-2026:30083: Red Hat build of Keycloak 26.6.4
Workarounds
CNA: To mitigate this issue, restrict network access to the Keycloak Admin REST API to only trusted networks or localhost. This limits the attack surface by preventing unauthorized access to the API endpoints required for exploitation. Consult your network security documentation for specific firewall or network access control configurations. This may impact remote administration capabilities.
ADP: To mitigate this issue, restrict network access to the Keycloak Admin REST API to only trusted networks or localhost. This limits the attack surface by preventing unauthorized access to the API endpoints required for exploitation. Consult your network security documentation for specific firewall or network access control configurations. This may impact remote administration capabilities.