\"@evil.com. PHP's FILTER_VALIDAT","datePublished":"2026-04-02T15:16:38.017","dateModified":"2026-06-17T10:36:07.857","about":{"@type":"Thing","name":"phpmyfaq phpmyfaq"}}
phpMyFAQ is an open source FAQ web application. Prior to version 4.1.1, an unauthenticated attacker can submit a guest FAQ with an email address that is syntactically valid per RFC 5321 (quoted local part) yet contains raw HTML — for example "<script>alert(1)</script>"@evil.com. PHP's FILTER_VALIDATE_EMAIL accepts this email as valid. The email is stored in the database without HTML sanitization and later rendered in the admin FAQ editor template using Twig's |raw filter, which bypasses auto-escaping entirely. This issue has been patched in version 4.1.1.
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