Update the WordPress Social Share Buttons by Supsystic plugin to the latest available version (at least 2.2.4).
FearZzZz discovered and reported this Broken Access Control vulnerability in WordPress Social Share Buttons by Supsystic 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 2.2.4.
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