Live › vulnerability › GHSA-gfv4-4vr2-rr4g
A Keycloak authorization flaw lets an authenticated user who holds a UMA permission ticket for one resource gain access to every resource of that type on the same resource server. The attacker gets unauthorized reads or changes to those resources.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-29 16:39 UTC. All times on this page are UTC.
Only resource servers in PERMISSIVE policy enforcement mode that use typed resources with ownerManagedAccess enabled and no explicit policy protecting the resource type are exposed. Deployments using enforcing mode or explicit policies on those resource types can skip it. Users must already be authenticated and hold a UMA permission ticket for one resource.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| org.keycloak:keycloak-services | maven | < 26.6.4 | – |
kc.sh --version or the keycloak-services jar version in your buildorg.keycloak:keycloak-services to 26.6.4 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
This advisory has been withdrawn because it is a duplicate of GHSA-w3p3-7cjg-vgfw. This link is maintained to preserve external references.
A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type. The primary consequence is unauthorized information disclosure or modification of resources.
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