Medium [CVE-2026-89298] Confidential client secret disclosed to view-clients role via Client Registration GET
This medium-severity Red Hat Linux advisory covers CVE-2026-89298 affecting Red Hat Build of Keycloak, Red Hat Single Sign-On 7.
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Summary
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 Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to already possess the view-clients administrative role.
Successful exploitation allows an attacker to retrieve cleartext client secrets for confidential clients, which can be used to impersonate the client and potentially escalate privileges. The vulnerability's root cause is a failure to apply secret masking to the Dynamic Client Registration GET endpoint.
Weakness: CWE-200. Affected Red Hat products: Red Hat Build of Keycloak; Red Hat Single Sign-On 7.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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