What the vulnerability does
01Description
The WPForms Pro plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.10.1.1 via the ajax_chunk_upload_finalize function. This is due to the file type validation occurring after chunk metadata and file contents have already been written to disk, and the assembled file not being deleted upon validation failure. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.
Explanation of Vulnerability in Simple Terms
02Summary
WPForms Pro versions up to 1.10.1.1 allow attackers to upload files without proper validation. An attacker can upload malicious files to the server, potentially gaining the ability to run code or access sensitive data. No authentication is required to exploit this vulnerability.
What an attacker can do
03Attacker Capabilities
Upload malicious files to the server and potentially run code or access sensitive data.
Potential impact on your site
04Site Impact
Attackers can upload and execute malicious files, compromising site integrity and confidentiality.
Conditions required to exploit
05Prerequisites
Network access to the WPForms upload endpoint; no authentication required.
Key dates
06Disclosure timeline
July 25, 2026
CVE published
