Red Hat Keycloak/Single Sign-On keycloak-services improper authorization

Summaryinfo

A vulnerability described as critical has been identified in Red Hat Keycloak and Single Sign-On. Impacted is an unknown function of the component keycloak-services. Such manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-125652. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Red Hat Keycloak and Single Sign-On (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component keycloak-services. 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:

A flaw was found in the keycloak-services component of Keycloak, which provides the core authentication and authorization logic for the identity provider. The issue occurs when a user initiates a login after visiting the password reset page, causing the system to skip mandatory security checks for Proof Key for Code Exchange (PKCE). This could allow an attacker who intercepts a login code to gain unauthorized access to the user's account without needing the required security verifier.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-125652 since 11/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. 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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