Arbitrary File Upload Vulnerability in Multi Uploader for Gravity Forms Plugin by WordPress

CVE-2026-87796

What is CVE-2026-87796?

CVE-2026-87796 is an arbitrary file upload vulnerability found in the Multi Uploader for Gravity Forms plugin used within WordPress environments. This WordPress plugin allows users to create forms that accept file uploads, enabling functionalities such as document submissions and media files. The vulnerability arises from inadequate validation of file types during the handling of chunked uploads, specifically through the move_file function. As a result, this flaw enables unauthenticated attackers to upload arbitrary files to the web server hosting the WordPress site. If exploited, this could lead to severe consequences such as remote code execution, where an attacker could deploy malicious code or files to take control of the server and compromise the entire web application, thereby affecting the organization’s data and operations.

Potential impact of CVE-2026-87796

1. Remote Code Execution: The most critical impact of this vulnerability is the potential for remote code execution, where malicious actors can run arbitrary code on the server. This capability allows for full control over the affected system, leading to unauthorized access to sensitive data, manipulation or deletion of files, and potentially the entire server environment being compromised.

2. Data Breach Risks: Organizations using the affected plugin risk exposing confidential and sensitive data. Unauthorized file uploads could include scripts or other harmful files, leading to data leakage or theft, which can have financial and reputational repercussions for the organization, especially if personal or sensitive information is involved.

3. Disruption of Services: Exploitation of this vulnerability can lead to significant disruption of online services. Attackers could utilize the uploaded files to initiate Denial-of-Service (DoS) attacks or destabilize the website, resulting in downtime, loss of service availability, and potential loss of revenue for businesses reliant on their online presence.

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