{"id":"CVE-2026-32629","aliases":["GHSA-98gw-w575-h2ph"],"url":"https://o3.security/vulnerability/CVE-2026-32629","summary":"phpMyFAQ: Stored XSS via Unsanitized Email Field in Admin FAQ Editor","details":"### Summary\nAn 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.\n\n### Details\n1. PHP FILTER_VALIDATE_EMAIL accepts RFC-valid quoted local parts with dangerous characters\n\nphpmyfaq/src/phpMyFAQ/Controller/Frontend/Api/FaqController.php:99\n$email = trim((string) Filter::filterVar($data->email, FILTER_VALIDATE_EMAIL));\nPHP accepts \"<script>alert(1)</script>\"@evil.com as a valid email (RFC 5321 allows <, > inside quoted local parts). Confirmed:\n\"<script>alert(1)</script>\"@evil.com => string (valid, not false)\n\n2. Email stored raw without HTML sanitization\n\nphpmyfaq/src/phpMyFAQ/Faq.php — email retrieved directly as $row->email from the database.\n\n3. Admin Twig template renders email with |raw\n\nphpmyfaq/assets/templates/admin/content/faq.editor.twig:296\n<input type=\"email\" name=\"email\" id=\"email\" value=\"{{ faqData['email'] | raw }}\" class=\"form-control\">\n\nAffected version: 4.2.0-alpha, commit f0dc86c8f\n\n\n### PoC\n**The reproduction of the vulnerability was implemented with the help of AI while reviewing the source code to generate the proof-of-concept. Please kindly note this for reference. Since the vulnerability has already been confirmed directly in the source code, the proof-of-concept code may be considered as a reference only.**\n\nPlease extract the attached compressed file and proceed.\n[poc.zip](https://github.com/user-attachments/files/25938058/poc.zip)\n\n\n0. (docker compose -f docker-compose.yml down -v)\n1. docker compose -f docker-compose.yml up -d mariadb php-fpm nginx\n2. bash exploit.sh\n-----\n1. Access http://localhost:8888/admin/\n2. Log in with admin / Admin1234!\n3. After logging in, check whether the URL remains http://localhost:8888/admin/\n4. Go to Content → FAQ Administration → edit \"poc\" → alert popup should appear\nIf it does not appear, you can also access it directly via:\nhttp://localhost:8888/admin/faq/edit/1/en\n\n\n<img width=\"1388\" height=\"239\" alt=\"스크린샷 2026-03-12 오후 11 42 52\" src=\"https://github.com/user-attachments/assets/b6d5446f-4eba-4cb2-9284-1bca4855142e\" />\n<img width=\"1171\" height=\"92\" alt=\"스크린샷 2026-03-12 오후 11 16 17\" src=\"https://github.com/user-attachments/assets/3578e429-7106-4616-92ed-4167816d40f0\" />\n\n\n### Impact\nWhen an administrator opens /admin/faq/edit/{id}/{lang} to review the pending FAQ, the injected script executes in the admin's browser context. This allows an attacker to:\n\n- Steal the administrator's session cookie → full admin account takeover\n- Perform arbitrary admin actions (create users, modify content, change configuration)\n- Pivot to further attacks on the server\n\nThe attack chain requires no authentication. By default, records.allowNewFaqsForGuests=true allows unauthenticated FAQ submission, and records.defaultActivation=false guarantees the administrator must visit the edit page to review it.\n\nNote on captcha: The built-in captcha is enabled by default when the PHP gd extension is present (spam.enableCaptchaCode=true). This prevents fully automated exploitation but does not prevent a targeted manual attack — an attacker can solve the captcha once and submit the payload. \n\n### Credits\nwooseokdotkim","published":"2026-04-02T14:43:14.799Z","modified":"2026-08-12T03:51:41.011897660Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"thorsten/phpmyfaq","fixedVersion":"4.1.1"},{"ecosystem":"Packagist","name":"phpmyfaq/phpmyfaq","fixedVersion":"4.1.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/thorsten/phpMyFAQ/releases/tag/4.1.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32629.json"},{"type":"ADVISORY","url":"https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-98gw-w575-h2ph"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32629"},{"type":"PACKAGE","url":"https://github.com/thorsten/phpMyFAQ"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:41.011897660Z"}}