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Monstra CMS through version 3.0.4 fails to properly restrict dangerous file extensions in its file upload functionality. While the application blocks .php and similar extensions, it does not block .pht or .phar extensions. This allows remote authenticated Admins or Editors to upload files containing arbitrary PHP code with these extensions, which can then be executed on the server, leading to remote code execution. This vulnerability is distinct from CVE-2017-18048.
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