LJ security breach; stuff has been fixed but some people may still be affected.

Some rogue embed decided to self-replicate itself across LJ by editing people's entries upon them viewing the malicious embed and not having those scripts being blocked.

You may know the beast by finding embeds in your recent entries that you did not put there, and how the entry is unlocked. If you post locked stuff, check your journals -- I'd rather you be safe than sorry.

Quick official announcement, details to come

More detailed unofficial rundown

Edit: news post with full rundown: http://news.livejournal.com/117957.html

Crossposted. comments.