Keycloak on Red Hat PERMISSIVE Policy Enforcement Mode authorization

Summaryinfo

A vulnerability identified as critical has been detected in Keycloak on Red Hat. This issue affects some unknown processing of the component PERMISSIVE Policy Enforcement Mode. The manipulation leads to authorization. This vulnerability is traded as CVE-2026-9799. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Keycloak on Red Hat (affected version not known). It has been rated as critical. This issue affects some unknown functionality of the component PERMISSIVE Policy Enforcement Mode. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2026-9799 since 05/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/25/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Keycloak

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

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