{"id":"CVE-2026-94589","published":"2026-10-10T04:18:19.713","lastModified":"2026-10-13T13:29:12.567","description":"The Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection) plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.4.5 via the extcf7_submit function. This is due to missing file extension, MIME type, and size validation in the signature field's validation_filter(), combined with the absence of PHP-execution guards in the upload directory and a sanitize_file_name() bypass that converts shell.php- into shell.php. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-434"],"vendors":[],"products":[],"references":[{"url":"https://plugins.trac.wordpress.org/browser/extensions-for-cf7/tags/3.4.5/admin/include/class.cf7-signature.php#L222","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/extensions-for-cf7/tags/3.4.5/admin/include/class.cf7-signature.php#L82","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/extensions-for-cf7/tags/3.4.5/includes/class.cf7-extensions.php#L289","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/extensions-for-cf7/tags/3.4.5/includes/class.form-data-store.php#L42","tags":[]},{"url":"https://plugins.trac.wordpress.org/changeset/3727009/extensions-for-cf7/trunk/admin/include/class.cf7-signature.php","tags":[]},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&new=3727009%40extensions-for-cf7%2Ftags%2F3.4.6&old=3672142%40extensions-for-cf7%2Ftags%2F3.4.5","tags":[]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/fa3193c4-dd3e-4d9e-be42-769c7358beae?source=cve","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The Contact Form 7 Extensions plugin allows unauthenticated attackers to upload arbitrary files, including potentially executable ones, due to insufficient validation of uploaded files and a sanitize_file_name() bypass that converts shell.php- into shell.php. This vulnerability can lead to remote code execution on the affected WordPress site.","exploitability":"Exploitation is straightforward for unauthenticated attackers with no preconditions required, as the vulnerability exists in a publicly accessible endpoint that accepts file uploads without authentication.","blast_radius":"If exploited, this vulnerability could allow attackers to execute arbitrary code on the WordPress server, potentially leading to full compromise of the web application and underlying infrastructure.","remediation":"Upgrade to version 3.4.6 or later to remediate this vulnerability.","detection":"Monitor for unusual file upload activity in the wp-content/uploads directory, particularly files with executable extensions like .php, .phtml, or .phar that appear without user interaction.","tags":["rce","web","wordpress","file-upload"],"model":"garnet-coder","analyzedAt":"2026-10-12T08:44:04.517Z"}}