CVE-2026-8830

[CVE catalog]

Severity

Medium · CVSS 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Published

May 18, 2026, 10:00:00 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.39% · Oct 25, 2026

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. keycloak: org.keycloak/keycloak-services: Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation A Moderate security flaw was found in Keycloak's WebAuthn credential registration process. This issue allows an authenticated attacker to bypass configured WebAuthn policies, such as algorithm requirements or user verification, by manipulating client-side JavaScript during registration. This bypass could lead to the registration of credentials that do not meet the intended security standards, potentially weakening the overall authentication posture. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.