Red Hat Build of Keycloak 2.0 keycloak-services improper authorization

Summaryinfo

A vulnerability classified as critical has been found in Red Hat Build of Keycloak 2.0. Affected by this vulnerability is an unknown functionality of the component keycloak-services. This manipulation causes improper authorization. The identification of this vulnerability is CVE-2026-16089. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Red Hat Build of Keycloak 2.0. Affected by this vulnerability is some unknown processing of the component keycloak-services. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity.

It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2026-16089 since 07/17/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/17/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

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

• Build of Keycloak

Version

• 2.0

License

• open-source

Website

• Vendor: https://www.redhat.com/

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