The Fancy Product Designer plugin for WordPress contains a TOCTOU race condition vulnerability (CWE-362) in the 'fpd_custom_uplod_file' AJAX action's 'url' parameter. The plugin validates the URL by calling getimagesize() to confirm it points to an image, then subsequently retrieves the URL content using file_get_contents(). Because these operations are not atomic and occur sequentially, an attacker can serve a valid image during the validation phase and then change the response to redirect the fetch to arbitrary internal or external URLs. This enables unauthenticated SSRF attacks, potentially allowing attackers to access internal resources or external systems via the vulnerable server.

Successful exploitation allows unauthenticated attackers to perform SSRF attacks through the vulnerable AJAX endpoint. This can lead to limited confidentiality and integrity impacts by enabling attackers to make arbitrary HTTP requests from the server to internal or external systems. The CVSS score of 6.5 reflects a medium severity with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts to confidentiality and integrity but not availability. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch links are provided, users should monitor the vendor's communications for updates. Until a patch is available, consider restricting access to the vulnerable AJAX endpoint or implementing web application firewall (WAF) rules to detect and block suspicious SSRF attempts targeting the 'fpd_custom_uplod_file' action.