Red Hat Single Sign-On 7 keycloak-services improper authentication

Summaryinfo

A vulnerability marked as critical has been reported in Red Hat Build of Keycloak, Data Grid 8, JBoss Enterprise Application Platform Expansion Pack and Single Sign-On 7. This affects an unknown function of the component keycloak-services. Performing a manipulation results in improper authentication. This vulnerability is cataloged as CVE-2026-16443. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Red Hat Build of Keycloak, Data Grid 8, JBoss Enterprise Application Platform Expansion Pack and Single Sign-On 7 (the affected version is unknown). This affects an unknown code of the component keycloak-services. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.

The advisory is shared at access.redhat.com. This vulnerability is uniquely identified as CVE-2026-16443 since 07/21/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/05/2026).

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

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Application Server Software

Vendor

• Red Hat

Name

• Build of Keycloak
• Data Grid 8
• JBoss Enterprise Application Platform Expansion Pack
• Single Sign-On 7

License

• open-source

Website

• Vendor: https://www.redhat.com/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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