CVE-2026-3911 Keycloak: Information disclosure of disabled user attributes via administrative endpoint
Authenticated users with view-users role can access hidden user attributes via an administrative endpoint, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3911?
CVE-2026-3911 is a low-severity vulnerability in Redhat Build of Keycloak, published on 11 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A flaw was found in Keycloak. An authenticated user with the view-users role could exploit a vulnerability in the UserResource component. By accessing a specific administrative endpoint, this user could improperly retrieve user attributes that were configured to be hidden. This unauthorized information disclosure could expose sensitive user data.
Weakness: CWE-359
Which versions are affected by CVE-2026-3911?
3 open source packages ship an affected version, including org.keycloak:keycloak-services and keycloak. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-services Maven | All versions to 26.5.5 | None |
org.keycloak:keycloak-services Maven | All versions to 26.5.5 | None |
keycloak Bitnami | From 26.4.0 | 26.4.1, 26.5.0 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-3911?
Apply the vendor's patch.
Is CVE-2026-3911 being exploited?
There is no known exploitation of CVE-2026-3911 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-2026-3911, GHSA-xh32-c9wx-phrp, MINI-368f-7h3g-gfwr, MINI-7cm2-6q72-42p5.