CVE-2026-8830
Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation
Description
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.
How to fix CVE-2026-8830
To remediate CVE-2026-8830, upgrade the affected package to a fixed version below.
- —upgrade to 26.6.3 or later
Is CVE-2026-8830 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-8830.
Affected packages (1)
- from 0, < 26.6.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |