What the vulnerability does
01Description
The Fancy Product Designer plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 6.4.8. This is due to a time-of-check/time-of-use (TOCTOU) race condition in the 'url' parameter of the fpd_custom_uplod_file AJAX action. The plugin validates the URL by calling getimagesize() first, then later retrieves the same URL using file_get_contents(). This makes it possible for unauthenticated attackers to exploit the timing gap to perform SSRF attacks by serving a valid image during validation, then changing the response to redirect to arbitrary internal or external URLs during the actual fetch.
Explanation of Vulnerability in Simple Terms
02Summary
Fancy Product Designer versions 6.4.8 and earlier contain a race condition vulnerability that allows attackers to read and modify sensitive data without authentication. The vulnerability stems from improper synchronization of concurrent operations, enabling attackers to access or alter information during a narrow timing window. No user interaction is required to exploit this issue.
What an attacker can do
03Attacker Capabilities
Read or modify sensitive data without logging in.
Potential impact on your site
04Site Impact
Unauthorized users can access and alter product designs, customer data, or configuration without credentials.
Conditions required to exploit
05Prerequisites
Network access to the affected Fancy Product Designer installation; no authentication required.
Key dates
06Disclosure timeline
December 16, 2025
CVE published
April 8, 2026
Record updated
