Bug 2531871 (CVE-2026-89298)
| Summary: | CVE-2026-89298 keycloak-services: keycloak-services: Confidential client secret disclosed to view-clients role via Client Registration GET | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security <prodsec-ir-bot> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | aschwart, aszczucz, boliveir, drichtar, mposolda, pjindal, rmartinc, ssilvert, sthorger, vmuzikar |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
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.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
A flaw was found in the org.keycloak.services.clientregistration Java package in Keycloak. The Dynamic Client Registration GET endpoint at /realms/{realm}/clients-registrations/default/{clientId} fails to mask the client secret in its response. While a similar issue was previously fixed for the Admin REST API, this specific endpoint was overlooked. An authenticated attacker with the view-clients role can exploit this to retrieve the cleartext secret of any confidential client in the realm. With this secret, the attacker can perform actions such as obtaining access tokens via the client credentials grant, potentially leading to full realm compromise if the client's service account has elevated permissions.