The Z-Downloads WordPress plugin before 1.11.6 does not sanitise and escape some parameters when outputting them in the page, which could allow unauthenticated visitors to perform Cross-Site Scripting attacks when accessing share URLs.
The Z-Downloads WordPress plugin before 1.11.5 does not properly validate files uploaded, allowing high privilege users such as admin to upload arbitrary files on the server even when they should not be allowed to (for example in multisite setup)
The Z-Downloads WordPress plugin before 1.11.7 does not properly validate uploaded files allowing for the uploading of SVGs containing malicious JavaScript.