Auth bypass in Red Hat Build Of Keycloak 26.4
CVE-2026-2366
A flaw was found in Keycloak. An authorization bypass vulnerability in the Keycloak Admin API allows any authenticated user, even those without administrative privileges, to enumerate the organization memberships of other users. This information disclosure occurs if the attacker knows the victim's unique identifier (UUID) and the Organizations feature is enabled.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Red Hat Build Of Keycloak 26.4 — versions 26.4.11-1, 26.4-14
- Red Hat Build Of Keycloak 26.4.11
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:6477 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:6478 (vendor-advisory, Vendor Advisory)
- access.redhat.com/security/cve/CVE-2026-2366 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-2366?
- CVE-2026-2366 is a low-severity vulnerability in Red Hat Build Of Keycloak 26.4, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 3.1/10. Published 2026-03-12.
- How severe is CVE-2026-2366?
- Low severity. CVSS v3 base score is 3.1 out of 10.