One of my websites, which uses Joomla as CMS got hacked as I had not paid attention to securing the site properly. After this I did go through the site carefully trying to remove any possible loopholes. Recently I realized that Uploading images through Media Manager or any other means were failing to upload. I tried various things but nothing was helping. I am listing some of them here: 1. Checking the Directory permissions. Even tried changing the unsafe mode of 777 to all the relevant directory. Did not help. 2. Tried disabling Flash based uploader – did not help.