The Store Locator for WordPress with Google Maps – LotsOfLocales plugin for WordPress is vulnerable to Local File Inclusion in version 3.98.9 via the 'sl_engine' parameter. This makes it possible for unauthenticated attackers to include and execute arbitrary files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where images and other “safe” file types can be uploaded and included.
The PHP application receives input from an upstream component, but it does not restrict or incorrectly restricts the input before its usage in "require," "include," or similar functions.