Vulnerability · Published Oct 17, 2026 · Assigned by VulnCheck
CVE-2026-111911phpMyFAQ 4.0.0 before 4.1.9 Authentication Bypass via WebAuthn Credential Injection
Critical 9.8
In plain English
A critical-severity improper authentication in phpMyFAQ from thorsten. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 54.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
phpMyFAQ 4.0.0 before 4.1.9 contains an authentication bypass vulnerability where WebAuthn registration endpoints attach credentials to any account without authentication or challenge validation. Attackers can stage a victim username, submit a forged fmt=none attestation to register a passkey, then log in bypassing passwords and TOTP for account takeover.
Affected products (as reported)
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Security Advisory (GHSA-g6cq-6rqg-6c9p) vendor-advisory
- GitHub Security Advisory (GHSA-rg9h-f29v-xhxr) vendor-advisory
- VulnCheck Advisory: phpMyFAQ 4.0.0 before 4.1.9 Authentication Bypass via WebAuthn Credential Injection third-party-advisory