Medium [CVE-2026-18573] Keycloak-services: keycloak-services: client access-type policy condition bypass during client update
This medium-severity Red Hat Linux advisory covers CVE-2026-18573 affecting Red Hat Build of Keycloak.
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Summary
A flaw was found in the keycloak-services component of Keycloak, which is used for managing authentication and authorization flows. The issue occurs when a realm administrator configures client policies to enforce specific authentication requirements on confidential clients.
Due to improper evaluation of the client state during an update operation, an attacker with client management permissions can bypass these security policies by first creating a public client and then updating it to a confidential client with weaker authentication.
This can result in the persistence of clients that do not comply with the intended security hardening of the realm.
Affected product named by the advisory: Red Hat Build of Keycloak.
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
- Due to improper evaluation of the client state during an update operation, an attacker with client management permissions can bypass these security policies by first creating a public client and then updating it to a confidential client with weaker authentication.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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