CVE-2026-37981 Keycloak Account Resources user lookup contains broken access control
Authenticated users with UMA resources can enumerate and harvest PII for all realm users via a broken access control flaw in the user lookup endpoint.
- 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-2026-37981?
CVE-2026-37981 is a medium-severity missing authorization vulnerability in Redhat Build of Keycloak, published on 19 May 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. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.
Weakness: CWE-1220
Which versions are affected by CVE-2026-37981?
5 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 | 26.4.12 |
org.keycloak:keycloak-services Maven | All versions | 26.4.12 |
org.keycloak:keycloak-services Maven | From 26.5.0 | 26.6.2 |
org.keycloak:keycloak-services Maven | From 26.5.0 | 26.6.2 |
keycloak Bitnami | From 26.4.0 | 26.4.12 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-37981?
Upgrade org.keycloak:keycloak-services to a fixed version for your release line: 26.4.12 or 26.6.2.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-37981 being exploited?
There is no known exploitation of CVE-2026-37981 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-2026-37981, ECHO-90f5-fff7-e790, GHSA-933f-rg6j-f46p, MINI-5fcm-rr3p-2w6f, MINI-6p9f-73fw-68hm.