CVE-2026-9796

[CVE catalog]

Severity

Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Published

May 27, 2026, 10:00:00 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.22% · Oct 25, 2026

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. keycloak: Keycloak: Privilege escalation via Time-of-Check to Time-of-Use (TOCTOU) vulnerability A Moderate privilege escalation flaw exists in Keycloak where an authenticated administrator with `manage-clients` privileges can exploit a Time-of-Check to Time-of-Use (TOCTOU) vulnerability. This allows them to escalate their privileges to `realm-admin` for all users within the realm, impacting the integrity of role-based access control. 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.