Update the WordPress Welcart e-Commerce plugin to the latest available version (at least 2.8.4).
István Márton discovered and reported this Broken Access Control vulnerability in WordPress Welcart e-Commerce Plugin. A broken access control issue refers to a missing authorization, authentication or nonce token check in a function that could lead to an unprivileged user to executing a certain higher privileged action. This vulnerability has been fixed in version 2.8.4.
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