CVE-2026-2366 Keycloak: keycloak: information disclosure via authorization bypass in admin api
Authenticated users can bypass authorization to enumerate other users' organization memberships if the Organizations feature is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-2366?
CVE-2026-2366 is a low-severity missing authorization vulnerability in Redhat Build of Keycloak, published on 12 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-2366?
5 open source packages ship an affected version, including org.keycloak:keycloak-js-admin-client, keycloak and @keycloak/keycloak-admin-client. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-js-admin-client Maven | All versions to 26.5.5 | None |
org.keycloak:keycloak-js-admin-client Maven | All versions to 26.5.5 | None |
keycloak Bitnami | From 26.4.0 | 26.4.11 |
@keycloak/keycloak-admin-client npm | All versions to 26.5.5 | None |
@keycloak/keycloak-admin-client npm | All versions to 26.5.5 | None |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-2366?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-2366 being exploited?
There is no known exploitation of CVE-2026-2366 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Sources
Also known as BIT-keycloak-2026-2366, GHSA-r8jr-wg88-fq5c.