Red Hat Keycloak Single Sign-On Pushed Authorization Request PAR Implementation improper authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in Red Hat Keycloak Single Sign-On. This affects an unknown part of the component Pushed Authorization Request PAR Implementation. Performing a manipulation results in improper authorization. This vulnerability is reported as CVE-2026-96446. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in Red Hat Keycloak Single Sign-On (affected version unknown). This affects an unknown functionality of the component Pushed Authorization Request PAR Implementation. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the Pushed Authorization Request PAR implementation of Keycloak. The issue occurs when the silent authentication path prompt=none is used, which allows the authorization process to skip certain steps if a user is already logged in. Due to this bypass, the security rule that ensures a pushed request URI is used only once is not enforced. An attacker could potentially reuse a request URI to obtain multiple authorization codes for a user who is already signed in, violating security standards like FAPI-2.

It is possible to read the advisory at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-96446 since 09/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. 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 09/23/2026). 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

• Keycloak Single Sign-On

License

• open-source

Website

• Vendor: https://www.redhat.com/

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