LinkedIn users could be facing yet another security problem.

A user in a Russian forum says that he has hacked and uploaded almost 6.5 million LinkedIn passwords, according to a story in the Verge. Though his claim has yet to be confirmed, Twitter users are already reporting that they've found their hashed LinkedIn passwords on the list, security expert Per Thorsheim said.

LinkedIn revealed through its own tweet that it'slooking into reports of stolen passwords, and it advised users to stay tuned for more information.