What the vulnerability does
01Description
The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to unauthorized arbitrary media deletion in all versions up to, and including, 1.1.8. This is due to missing capability checks in the `plupload_ajax_delete_file()` function, which is registered via `wp_ajax_nopriv_gfmu_delete_file`. The nonce intended for CSRF protection is exposed on any public-facing page containing a multi-uploader form field via the `GFMU_options` JavaScript object. This makes it possible for unauthenticated attackers to permanently delete any WordPress media attachment by supplying its attachment ID, potentially leading to complete media library destruction.
Explanation of Vulnerability in Simple Terms
02Summary
Multi Uploader for Gravity Forms versions 1.1.8 and earlier lack proper authorization checks on file upload functionality. An unauthenticated attacker can upload arbitrary files to the site without permission, potentially modifying site content or introducing malicious files. Update to a version newer than 1.1.8 immediately.
What an attacker can do
03Attacker Capabilities
Upload arbitrary files to the site without authentication or permission.
Potential impact on your site
04Site Impact
Attackers can upload malicious files, modify site content, or compromise site integrity without needing a user account.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
August 5, 2026
CVE published
