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Vulnerabilities CVE-2026-9796

CVE-2026-9796

Medium
Open
TLP:CLEAR

Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnerability

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Description

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.

Details

CVSS Score
6.5
EPSS Score
0.19%

8.5th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
May 28, 2026
Last Modified
Aug 11, 2026
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