CVE-2026-111911

Critical

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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductphpMyFAQ

PublishedOct 17, 2026

First seenOct 17, 2026

Weakness typeCWE-287Improper authentication

How to fix

Update

thorsten phpMyFAQ4.1.9 or later

Vendor advisories

github.com/thorsten/phpMyFAQ/security/advisories/GHSA-g6cq-6rqg-6c9p
github.com/thorsten/phpMyFAQ/security/advisories/GHSA-rg9h-f29v-xhxr

Affected products

Product	Affected versions	Fixed in
thorsten phpMyFAQ	4.0.0 ≤ v < 4.1.9	4.1.9

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