The ZYREX POPUP WordPress plugin through 1.0 does not validate the type of files uploaded when creating a popup, allowing a high privileged user (such as an Administrator) to upload arbitrary files, even when modifying the file system is disallowed, such as in a multisite install.
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
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https://wpscan.com/vulnerability/0fd0d7a5-9263-43b6-9244-7880c3d3e6f4 | third party advisory vdb entry exploit technical description |