CVE-2026-8830 Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation
Authenticated users can bypass WebAuthn security policies by manipulating client-side JavaScript, allowing non-compliant credential registration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8830?
CVE-2026-8830 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 19 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-603
Which versions are affected by CVE-2026-8830?
2 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-services Maven | All versions | 26.6.3 |
org.keycloak:keycloak-services Maven | All versions | 26.6.3 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-8830?
Upgrade org.keycloak:keycloak-services to 26.6.3 or later.
Is CVE-2026-8830 being exploited?
There is no known exploitation of CVE-2026-8830 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Sources
Also known as ECHO-6007-5dc2-524b, GHSA-g8vr-x4qh-25qg, MINI-4953-529j-crv9, MINI-fm86-vx82-x4fh.