CVE-2026-111911
phpMyFAQ 4.0.0 before 4.1.9 Authentication Bypass via WebAuthn Credential Injection
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 17, 2026
- Updated
- Oct 19, 2026
- Reserved
- Oct 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-287 Improper Authentication
Affected Products
| Product | Versions |
|---|---|
phpMyFAQthorsten |
|
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 Injectionthird-party-advisory
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