glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 Plugin wpcf7_antiscript_file_name unrestricted upload

Summaryinfo

A vulnerability labeled as critical has been found in glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 Plugin up to 1.3.9.6 on WordPress. Impacted is the function wpcf7_antiscript_file_name. Such manipulation leads to unrestricted upload. This vulnerability is listed as CVE-2026-5718. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 Plugin up to 1.3.9.6 on WordPress and classified as critical. Affected by this issue is the function wpcf7_antiscript_file_name. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented by Leonid Semenenko. The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-5718 since 04/06/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1608.002.

Upgrading to version 1.3.9.6 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• glenwpcoder

Name

• Drag and Drop Multiple File Upload for Contact Form 7 Plugin

Version

• 1.3.9.0
• 1.3.9.1
• 1.3.9.2
• 1.3.9.3
• 1.3.9.4
• 1.3.9.5
• 1.3.9.6

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CPE 2.2info

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