CVE-2026-5718
HighSummary
The Drag and Drop Multiple File Upload plugin for Contact Form 7 in WordPress is vulnerable to arbitrary file upload in versions up to and including 1.3.9.7. The issue arises from insufficient file type validation and bypassing of the sanitization function for filenames containing non-ASCII characters.
Risk Assessment
Unauthenticated attackers can upload arbitrary files, including PHP files, which may lead to remote code execution on the server. This poses a significant security risk to the system.
Recommendation
It is recommended to update the plugin to the latest version to mitigate this vulnerability. Additionally, conducting a security audit of the server to identify potential threats is advisable.
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Original NVD description (English source)
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, 1.3.9.7. 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. The vulnerability was originally reported by Leonid Semenenko (lsemenenko) and partially patched in version 1.3.9.7. A bypass for the patch was separately discovered and reported by Nguyen Hung (Mitchell).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

