Red Hat Keycloak/Single Sign-On Secure Redirect URIs Enforcer Client Policy improper authorization

Summaryinfo

A vulnerability classified as critical has been found in Red Hat Keycloak and Single Sign-On. Affected is an unknown function of the component Secure Redirect URIs Enforcer Client Policy. Performing a manipulation results in improper authorization. This vulnerability is reported as CVE-2026-118425. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Red Hat Keycloak and Single Sign-On (version now known). This affects some unknown processing of the component Secure Redirect URIs Enforcer Client Policy. 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 secure-redirect-uris-enforcer client policy of Keycloak, an identity and access management solution. The issue occurs when the policy is configured to allow loopback addresses, as Keycloak resolves hostnames via DNS during validation. An attacker can bypass domain allowlist restrictions by using a hostname that resolves to a loopback address, potentially allowing the registration of unauthorized redirect URIs.

It is possible to read the advisory at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-118425 since 10/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. 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 10/29/2026). 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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