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 3.1

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

EPSS

0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-25)

CWE

CWE-367

Published

2026-05-28

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• redhat:build_of_keycloak

Packages (OSV)

References

• 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
• https://bugzilla.redhat.com/show_bug.cgi?id=2482464

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