The S3Player WordPress plugin through 4.2.1 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against only unauthenticated users.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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https://wpscan.com/vulnerability/9cc7c5cb-983f-4593-abc5-7e224b275a23/ | third party advisory exploit technical description vdb entry |