Multiple themes - Unauthenticated Arbitrary File Upload

The WeStand WordPress theme before 2.1, footysquare WordPress theme, aidreform WordPress theme, statfort WordPress theme, club-theme WordPress theme, kingclub-theme WordPress theme, spikes WordPress theme, spikes-black WordPress theme, soundblast WordPress theme, bolster WordPress theme from ChimpStudio and PixFill does not have any authorisation and upload validation in the lang_upload.php file, allowing any unauthenticated attacker to upload arbitrary files to the web server.