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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.

PUBLISHED Reserved 2026-05-18 | Published 2026-05-19 | Updated 2026-05-19 | Assigner redhat




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

Problem types

Use of Client-Side Authentication

Product status

Default status
affected

Timeline

2026-05-18:Reported to Red Hat.
2026-05-19:Made public.

Credits

Red Hat would like to thank Martin Bartoš (RedHat) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-8830 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2479565 (RHBZ#2479565) issue-tracking

cve.org (CVE-2026-8830)

nvd.nist.gov (CVE-2026-8830)

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