Red Hat Keycloak Client Policy Enforcement access control

Summaryinfo

A vulnerability categorized as problematic has been discovered in Red Hat Keycloak. This vulnerability affects unknown code of the component Client Policy Enforcement. Executing a manipulation can lead to access control. This vulnerability is tracked as CVE-2026-18207. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in Red Hat Keycloak (affected version unknown). This vulnerability affects an unknown functionality of the component Client Policy Enforcement. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in the client policy enforcement mechanism of Keycloak. The issue occurs when the system checks group membership by name instead of a unique identifier. An attacker with client management privileges could bypass security policies by joining a group with a matching name in a different part of the group hierarchy, potentially allowing them to register or update clients without following required security hardening profiles.

The advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2026-18207 since 07/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/29/2026). The MITRE ATT&CK project declares the attack technique as T1068.

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

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2573). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Open Source Keycloak

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Vendor

• Red Hat

Name

• Keycloak

License

• open-source

Website

• Vendor: https://www.redhat.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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