Imgur XSS Posted by tetrep on Monday September 21, 2015 @09:34PM from the reddit.com dept. https://www.reddit.com/r/4chan/comments/3lutoo/imgur_is_doing_fishy_things_with_4chan_screencaps/cv9lqrt ( 1 comment | 6 points | on HN )
Imgur has acknowledged the exploit: https://twitter.com/imgur/status/646109742004224000
Looks like the exploit was a combination of a misconfiguration in the way direct images are displayed on Imgur as well as some kind of Adobe Flash zero-day.