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3.1

Keycloak: Unauthorized Access to User Organization Memberships

CVE-2026-2366 · published 7 months ago
Summary

Keycloak's Admin API allows any authenticated user to see who's in other users' organizations if they know the user's ID and the organization feature is turned on. This means an attacker could get information about who's in a user's group without needing special permissions. To fix this, Keycloak users should ensure only authorized users have access to the Admin API.

What to do
  • Update keycloak to version 26.4.11.
  • Update redhat build_of_keycloak to version 26.4.11 or later.
Affected software
Ecosystem VendorProductAffected versions
npm keycloak keycloak-admin-client <= 26.5.5
maven keycloak org.keycloak:keycloak-js-admin-client <= 26.5.5
– redhat build_of_keycloak >= 26.4, < 26.4.11
cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
Bitnami – keycloak >= 26.4.0, < 26.4.11
Fix: upgrade to 26.4.11
Original advisory text
Keycloak: keycloak: information disclosure via authorization bypass in admin api
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
3.1 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-639Authorization Bypass Through User-Controlled Key
Timeline
Published12 Mar 2026
Updated4 Nov 2026
First seen12 Mar 2026
Sources
CVE-2026-2366 · NVD
GHSA-r8jr-wg88-fq5c · GHSA
BIT-keycloak-2026-2366 · OSV
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