CVE-2026-8830
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
A flaw was found in Keycloak that allows an authenticated user to bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the new credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies.
Risk Assessment
This vulnerability could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.
Recommendation
It is recommended to immediately update Keycloak to a version where the validation of WebAuthn credential parameters in the processAction() method has been fixed.
Original NVD description (English source)
A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.