CVE-2026-4628 Keycloak: org.keycloak.authorization: keycloak: unauthorized resource modification due to improper access control
Attackers with valid credentials can bypass access restrictions to modify protected resources in Keycloak's UMA endpoint, compromising data integrity.
- 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-2026-4628?
CVE-2026-4628 is a medium-severity missing authorization vulnerability in Redhat Build of Keycloak, published on 23 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 improper Access Control vulnerability in Keycloak’s User-Managed Access (UMA) resource_set endpoint allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false restriction. This occurs due to incomplete enforcement of access control checks on PUT operations to the resource_set endpoint. This issue enables unauthorized modification of protected resources, impacting data integrity.
Weakness: CWE-284
Which versions are affected by CVE-2026-4628?
2 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-services Maven | All versions to 26.6.0 | None |
org.keycloak:keycloak-services Maven | All versions to 26.6.0 | None |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-4628?
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-2026-4628 being exploited?
There is no known exploitation of CVE-2026-4628 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 ECHO-2e54-ce79-4b18, GHSA-4pgc-gfrr-wcmg, MINI-7473-qmjr-4jr4, MINI-gjhm-82v8-965j.