Update the WordPress MailOptin plugin to the latest available version (at least 1.2.50.0).
Muhammad Daffa discovered and reported this Broken Access Control vulnerability in WordPress MailOptin 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 1.2.50.0.
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