by Kastro
Paper/Archive/CVE-2026-111911

CVE-2026-111911

thorsten phpMyFAQ — phpMyFAQ 4.0.0 before 4.1.9 Authentication Bypass via WebAuthn Credential Injection

EPSS 0.5%public exploitCVSS 9.8
critical.is priorityof 100
48
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 45.0.450 × 209.0Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
phpMyFAQ4.0.0 – < 4.1.94.1.9CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/thorsten/phpMyFAQ/security/advisories/GHSA-g6cq-6rqg-6c9padvisorygithub.com/thorsten/phpMyFAQ/security/advisories/GHSA-rg9h-f29v-xhxrwriteupvulncheck.com/advisories/phpmyfaq-4.0.0-before-4.1.9-authentication-bypass-via-webauthn-credential-injection