Update the WordPress CMP – Coming Soon & Maintenance plugin to the latest available version (at least 4.0.19).
Krzysztof Zając discovered and reported this Broken Access Control vulnerability in WordPress CMP – Coming Soon & Maintenance 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 4.0.19.
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