WP Contact Form 7 DB Handler <= 3.0 - Cross-Site Request Forgery to Arbitrary File Deletion via 'contact_form' Parameter

Wordfence Intelligence   >   Vulnerability Database   >   WP Contact Form 7 DB Handler <= 3.0 - Cross-Site Request Forgery to Arbitrary File Deletion via 'contact_form' Parameter
8.1
Cross-Site Request Forgery (CSRF)
CVE CVE-2026-6455
CVSS 8.1 (High)
Publicly Published May 27, 2026
Last Updated May 28, 2026
Researchers Louis Deschanel (JeanJeanLeHaxor) - Patrowl
Pascal SUN - Patrowl

Description

The WP Contact Form 7 DB Handler plugin for WordPress is vulnerable to Cross-Site Request Forgery leading to Arbitrary File Deletion via SQL Injection and PHP Object Injection in versions up to and including 3.0. This is due to a missing nonce verification in the process_bulk_action() function, the nonce check is only executed when _wpnonce is present in the POST body, allowing it to be trivially bypassed by omitting the field, combined with the use of an unsanitized, unparameterized user-supplied value in a numeric SQL context (WHERE ID = $ID) and the unsafe deserialization of the query result's post_content field. An attacker can craft a CSRF page that tricks a logged-in administrator into triggering a UNION-based SQL injection payload (using CHAR() to avoid esc_sql quote-escaping) that returns a malicious serialized PHP array as post_content; upon deserialization, array values associated with keys containing 'ys_cfdbh_file' are used as file paths appended to the uploads directory path without any path traversal validation, and then passed to wp_delete_file(), allowing the attacker to delete arbitrary files on the server (e.g., wp-config.php, system files).

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Vulnerability Details for WP Contact Form 7 DB Handler

WP Contact Form 7 DB Handler

Software Type Plugin
Software Slug wp-contact-form-7-db-handler (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.1, or a newer patched version
Affected Version
  • <= 3.0
Patched Version
  • 3.1

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