Authenticator registration bypass via always-enabled none verifier
Published Feb 27, 2026 · Updated Feb 27, 2026
Authentication policy bypass in Keycloak and Red Hat build of Keycloak allows remote attackers to register untrusted WebAuthn authenticators. The registration path always enables the fmt none attestation verifier, so it accepts proofless objects even when a realm requests direct or indirect attestation. Exploitation requires user interaction during a WebAuthn registration ceremony in an attestation-enforcing realm; the bounded result is unauthorized authenticator enrollment.
Summary
What happened
Authentication policy bypass in Keycloak and Red Hat build of Keycloak allows remote attackers to register untrusted WebAuthn authenticators. The registration path always enables the fmt none attestation verifier, so it accepts proofless objects even when a realm requests direct or indirect attestation. Exploitation requires user interaction during a WebAuthn registration ceremony in an attestation-enforcing realm; the bounded result is unauthorized authenticator enrollment.
The record
- CVE
- CVE-2025-12150
- Published
- Feb 27, 2026
- Updated
- Feb 27, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-347, T1556.006
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 27, 2026CVE publishedPublication date reported by the CVE source.
- Feb 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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