CVE-2026-9796

A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check to time-of-use (TOCTOU) vulnerability in the name-based admin role checks. This allows the attacker to escalate their privileges to `realm-admin` for all users within the realm, granting them extensive control over the system. The composite role relationship persists even after the attacker's own permissions are revoked and across system reboots.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:56523
https://access.redhat.com/errata/RHSA-2026:56524
https://access.redhat.com/security/cve/CVE-2026-9796	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2482464	Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*

History

26 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) Se encontró una falla en Keycloak. Un administrador autenticado con el rol ’manage-clients’ puede explotar una vulnerabilidad de tipo Time-of-check to time-of-use (TOCTOU) en las comprobaciones de roles de administrador basadas en nombres. Esto permite al atacante escalar sus privilegios a ’realm-admin’ para todos los usuarios dentro del reino, otorgándoles un control extenso sobre el sistema. La relación de rol compuesto persiste incluso después de que se revoquen los propios permisos del atacante y tras los reinicios del sistema.

Information

Published : 2026-05-28 05:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-9796

Mitre link : CVE-2026-9796

CVE.ORG link : CVE-2026-9796

JSON object : View

Products Affected

redhat

build_of_keycloak

CWE

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

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