CVE-2026-9796 — MEDIUM (6.5)

Vulnerability 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.

CVSS Score

6.5

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-

Related Weaknesses (CWE)

CWE-367

References

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

FAQ

What is CVE-2026-9796?

CVE-2026-9796 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 ...

How severe is CVE-2026-9796?

CVE-2026-9796 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-9796?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.