{"id":"CVE-2026-101335","aliases":["EUVD-2026-102637","GHSA-j6gp-6943-4w67"],"status":"published","title":"Forminator Forms \u003c= 1.58.1 - Unauthenticated Arbitrary Shortcode Execution via 'User-Agent' Header and 'referer_url' Parameter via Quiz Notification Merge Tags","description":"The Forminator Forms – Contact Form, Payment Form \u0026 Custom Form Builder plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 1.58.1. This is due to the forminator_replace_quiz_form_data() helper invoking do_shortcode() on the fully expanded notification body once the {quiz_result} merge tag has been substituted, while the earlier-substituted {user_agent} and {refer_url} merge tags carry unauthenticated attacker-controlled bytes (the User-Agent header and the referer_url POST parameter) through sanitize_text_field()/esc_html(), neither of which strip the '[' and ']' shortcode delimiters. This makes it possible for unauthenticated attackers to execute arbitrary WordPress shortcodes registered on the site by submitting a quiz whose notification template contains {quiz_result}; the resulting impact depends on the shortcodes exposed by other installed plugins/themes and can range from arbitrary content injection to information disclosure.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.0028,"percentile":0.20613,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-94"],"published":"2026-10-16T04:26:58Z","modified":"2026-10-16T15:16:58Z","products":[{"vendor":"wpmudev","product":"forminator forms – contact form, payment form \u0026 custom form builder"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/27640d44-1474-416a-8efd-e9524f9d3c7f?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/helpers/helper-fields.php#L2965"},{"url":"https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/helpers/helper-fields.php#L1652"},{"url":"https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/helpers/helper-fields.php#L1476"},{"url":"https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/modules/quizzes/front/front-mail.php#L36"},{"url":"https://plugins.trac.wordpress.org/browser/forminator/tags/1.57.3/library/abstracts/abstract-class-front-action.php#L127"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=\u0026old=3745883%40forminator\u0026new=3745883%40forminator"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101335"},{"url":"https://github.com/advisories/GHSA-j6gp-6943-4w67"}],"sources":{"cve":[{"id":"CVE-2026-101335","title":"Forminator Forms \u003c= 1.58.1 - Unauthenticated Arbitrary Shortcode Execution via 'User-Agent' Header and 'referer_url' Parameter via Quiz Notification Merge Tags","description":"The Forminator Forms – Contact Form, Payment Form \u0026 Custom Form Builder plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 1.58.1. This is due to the forminator_replace_quiz_form_data() helper invoking do_shortcode() on the fully expanded notification body once the {quiz_result} merge tag has been substituted, while the earlier-substituted {user_agent} and {refer_url} merge tags carry unauthenticated attacker-controlled bytes (the User-Agent header and the referer_url POST parameter) through sanitize_text_field()/esc_html(), neither of which strip the '[' and ']' shortcode delimiters. This makes it possible for unauthenticated attackers to execute arbitrary WordPress shortcodes registered on the site by submitting a quiz whose notification template contains {quiz_result}; the resulting impact depends on the shortcodes exposed by other installed plugins/themes and can range from arbitrary content injection to information disclosure.","status":"published","published":"2026-10-16T04:26:58.967Z","modified":"2026-10-16T15:09:40.456Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T14:20:09.448255Z"}],"euvd":[{"id":"EUVD-2026-102637","description":"The Forminator Forms – Contact Form, Payment Form \u0026 Custom Form Builder plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 1.58.1. This is due to the forminator_replace_quiz_form_data() helper invoking do_shortcode() on the fully expanded notification body once the {quiz_result} merge tag has been substituted, while the earlier-substituted {user_agent} and {refer_url} merge tags carry unauthenticated attacker-controlled bytes (the User-Agent header and the referer_url POST parameter) through sanitize_text_field()/esc_html(), neither of which strip the '[' and ']' shortcode delimiters. This makes it possible for unauthenticated attackers to execute arbitrary WordPress shortcodes registered on the site by submitting a quiz whose notification template contains {quiz_result}; the resulting impact depends on the shortcodes exposed by other installed plugins/themes and can range from arbitrary content injection to information disclosure.","status":"published","published":"2026-10-16T04:26:58Z","modified":"2026-10-16T15:09:40Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T17:00:05.229655Z"}],"ghsa":[{"id":"GHSA-j6gp-6943-4w67","title":"The Forminator Forms – Contact Form, Payment Form \u0026 Custom Form Builder plugin for WordPress is...","description":"The Forminator Forms – Contact Form, Payment Form \u0026 Custom Form Builder plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 1.58.1. This is due to the forminator_replace_quiz_form_data() helper invoking do_shortcode() on the fully expanded notification body once the {quiz_result} merge tag has been substituted, while the earlier-substituted {user_agent} and {refer_url} merge tags carry unauthenticated attacker-controlled bytes (the User-Agent header and the referer_url POST parameter) through sanitize_text_field()/esc_html(), neither of which strip the '[' and ']' shortcode delimiters. This makes it possible for unauthenticated attackers to execute arbitrary WordPress shortcodes registered on the site by submitting a quiz whose notification template contains {quiz_result}; the resulting impact depends on the shortcodes exposed by other installed plugins/themes and can range from arbitrary content injection to information disclosure.","status":"published","published":"2026-10-16T06:30:25Z","modified":"2026-10-16T06:30:32Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T15:13:50.508143Z"}],"nvd":[{"id":"CVE-2026-101335","description":"The Forminator Forms – Contact Form, Payment Form \u0026 Custom Form Builder plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 1.58.1. This is due to the forminator_replace_quiz_form_data() helper invoking do_shortcode() on the fully expanded notification body once the {quiz_result} merge tag has been substituted, while the earlier-substituted {user_agent} and {refer_url} merge tags carry unauthenticated attacker-controlled bytes (the User-Agent header and the referer_url POST parameter) through sanitize_text_field()/esc_html(), neither of which strip the '[' and ']' shortcode delimiters. This makes it possible for unauthenticated attackers to execute arbitrary WordPress shortcodes registered on the site by submitting a quiz whose notification template contains {quiz_result}; the resulting impact depends on the shortcodes exposed by other installed plugins/themes and can range from arbitrary content injection to information disclosure.","status":"published","published":"2026-10-16T05:17:27.933Z","modified":"2026-10-16T15:16:58.983Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T14:12:59.751798Z"}]}}