Red Hat Keycloak/Single Sign-On Dynamic Client Registration improper authorization

Summaryinfo

A vulnerability, which was classified as critical, was found in Red Hat Keycloak and Single Sign-On. Affected by this vulnerability is an unknown functionality of the component Dynamic Client Registration. Such manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-92857. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Red Hat Keycloak and Single Sign-On (affected version not known). Affected by this issue is some unknown functionality of the component Dynamic Client Registration. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register their own applications. A flaw in how Keycloak validates these registration requests allows an attacker to create a malicious application that forges identity information. By mapping their own user profile details to protected fields like the user ID (sub) or intended audience (aud), an attacker can generate signed security tokens that make them appear to be a different user. This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-92857 since 09/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1548.002.

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

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Productinfo

Vendor

• Red Hat

Name

• Keycloak
• Single Sign-On

License

• open-source

Website

• Vendor: https://www.redhat.com/

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