GitHub Advisoryadvisory · Maven
GHSA-g8vr-x4qh-25qg Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation
MEDIUM
Official page ↗
- Aliases
- CVE-2026-8830
- Ecosystem
- Maven
- Packages
- org.keycloak:keycloak-services
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-603
- Reviewed
- 2026-06-04
Affected packages
• Maven org.keycloak:keycloak-services: < 26.6.3 → fixed in 26.6.3
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.
Related
Alias · CVE (1)
- CVE-2026-8830 A flaw was found in Keycloak. vulnerability
Weakness · CWE (1)
- CWE-603 Use of Client-Side Authentication weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-8830 advisory
- https://github.com/keycloak/keycloak/issues/49133 web
- https://github.com/keycloak/keycloak/pull/49344 web
- https://github.com/keycloak/keycloak/commit/47b9aef70948564151af85fd52e0d7e508c76490 web
- https://github.com/keycloak/keycloak/commit/d3da77ef363d698e7a74470ba52fcdce09e394c4 web
- https://access.redhat.com/errata/RHSA-2026:25097 web
- https://access.redhat.com/errata/RHSA-2026:25098 web
- https://access.redhat.com/errata/RHSA-2026:30049 web
- https://access.redhat.com/errata/RHSA-2026:30050 web
- https://access.redhat.com/security/cve/CVE-2026-8830 web
- https://bugzilla.redhat.com/show_bug.cgi?id=2479565 web
- https://github.com/keycloak/keycloak package