Red Hat Keycloak/Single Sign-On Dynamic Client Registration Service information disclosure

Summaryinfo

A vulnerability described as problematic has been identified in Red Hat Keycloak and Single Sign-On. This issue affects some unknown processing of the component Dynamic Client Registration Service. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-89298. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Red Hat Keycloak and Single Sign-On (unknown version). Affected by this issue is an unknown code block of the component Dynamic Client Registration Service. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

A flaw was found in the Dynamic Client Registration service of Keycloak, an open-source identity and access management solution. The issue occurs when a user with the view-clients role accesses the client registration endpoint to retrieve client details. Due to a failure to mask sensitive information, the service returns the client's confidential secret in cleartext. This could allow a read-only administrator to obtain full access to the affected client's account and potentially escalate their privileges within the realm.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-89298 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/11/2026). The MITRE ATT&CK project declares the attack technique as T1592.

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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