I received an email from my hosting provider saying that the wp-content/uploads directory and subs are set to 777 and indicating that this is a security issue. It recommended changing the permissions to 755.
I note that the subdirectories WP creates automatically when it uploads media for me are also set to 777.
Is this a security issue? What are the ramifications of this?
Some background, only if you’re interested!: I made a little blog last year for travelling. While we were away it was hacked such that when we looked at it one morning it had all sorts of crap across it. I fixed it (maybe?) by changing the theme, deleting the users, deleting the old theme files... I was posting to it from the WP app on an iPad over 3G networks in the places we visited. Travelling again soon and hope it won’t happen again. I don’t know if this is related to my question.
Thanks for your time.