PT-2026-33468 · Glenwpcoder · Drag/Drop Multiple File Upload – Contact Form 7

Leonid Semenenko · Published 2026-04-17 · Updated 2026-04-17 · CVE-2026-5718

NVD

CVSS v3.1

8.1

High

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.6. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7 antiscript file name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution.

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-5718

Affected Products

Drag/Drop Multiple File Upload – Contact Form 7

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-5718 · Security Note
• https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L987 · Note
• https://plugins.trac.wordpress.org/changeset/3508522/drag-and-drop-multiple-file-upload-contact-form-7 · Note
• https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L62 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/38f95d40-a6d4-429c-9872-9d2531e942eb?source=cve · Note
• https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L970 · Note
• https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L883 · Note
• https://twitter.com/VulmonFeeds/status/2045227307313275046 · Twitter Post