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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.

PUBLISHED Reserved 2026-05-28 | Published 2026-05-28 | Updated 2026-05-28 | Assigner redhat




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

Problem types

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

Product status

Default status
affected

Timeline

2026-05-28:Reported to Red Hat.
2026-05-28:Made public.

Credits

Red Hat would like to thank Daniel Peters (Operating Intelligence Inc.), Lior Moshe (Operating Intelligence Inc.), and Uri Rolls (Operating Intelligence Inc.) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-9796 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2482464 (RHBZ#2482464) issue-tracking

cve.org (CVE-2026-9796)

nvd.nist.gov (CVE-2026-9796)

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