glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 Plugin Email Attachment dnd_wpcf7_posted_data path traversal

Summaryinfo

A vulnerability described as critical has been identified in glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 Plugin up to 1.3.9.6 on WordPress. The impacted element is the function dnd_wpcf7_posted_data of the component Email Attachment Handler. Executing a manipulation of the argument mfile[] can lead to path traversal. This vulnerability is registered as CVE-2026-5710. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

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. It has been declared as critical. This vulnerability affects the function dnd_wpcf7_posted_data of the component Email Attachment Handler. The manipulation of the argument mfile[] with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to Path Traversal leading to Arbitrary File Read in versions up to and including 1.3.9.6. This is due to the plugin using client-supplied mfile[] POST values as the source of truth for email attachment selection without performing any server-side upload provenance check, path canonicalization, or directory containment boundary enforcement. In dnd_wpcf7_posted_data(), each user-submitted filename is directly appended to the plugin's upload URL without sanitization. In dnd_cf7_mail_components(), the URL is converted back to a filesystem path using str_replace() and only file_exists() is used as the acceptance check before attaching the file to the outgoing CF7 email. This makes it possible for unauthenticated attackers to read and exfiltrate arbitrary files readable by the web server process via path traversal sequences in the mfile[] parameter, with files being disclosed as email attachments. Note: This vulnerability is limited to the 'wp-content' folder due to the wpcf7_is_file_path_in_content_dir() function in the Contact Form 7 plugin.

The weakness was published by Osvaldo Noe Gonzalez Del Rio. The advisory is available at wordfence.com. This vulnerability was named CVE-2026-5710 since 04/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

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

CPE 2.3info

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CPE 2.2info

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Entryinfo

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