WordPress · Drag/Drop Multiple File Upload · CVE-2026-5718
**Name of the Vulnerable Software and Affected Versions**
Drag and Drop Multiple File Upload for Contact Form 7 versions prior to 1.3.9.7
**Description**
Insufficient file type validation occurs when custom blacklist types are configured, as the system replaces the default dangerous extension denylist instead of merging with it. Additionally, the `wpcf7 antiscript file name()` function can be bypassed using filenames containing non-ASCII characters. This allows unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, potentially leading to remote code execution.
**Recommendations**
Update to a version later than 1.3.9.6.