جزئیات آسیب‌پذیری

Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register their own applications. A flaw in how Keycloak validates these registration requests allows an attacker to create a malicious application that forges identity information. By mapping their own user profile details to protected fields like the user ID (sub) or intended audience (aud), an attacker can generate signed security tokens that make them appear to be a different user. This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification.

• https://access.redhat.com/errata/RHSA-2026:95759 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:95760 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:95761 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:95762 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/security/cve/CVE-2026-92857 vdb-entryx_refsource_REDHAT
• https://bugzilla.redhat.com/show_bug.cgi?id=2535817 issue-trackingx_refsource_REDHAT