If you’re one of LinkedIn’s 150 million users, you might want to change your password — the business networking site has allegedly been hacked, and millions of log-in credentials may have been compromised.

Activity on a Russian hacker forum indicates more than six million encrypted passwords have been leaked, with about 300,000 of them already cracked. Finnish security firm CERT-FI says that the hackers could also have access to user email addresses, but they seem to be unreadable at this point.

Although the hack affects a small percentage of LinkedIn members and the company’s official Twitter account only says the site is “looking into reports of stolen passwords,” internet security experts are advising people to change their passwords as soon as possible.

[ZD Net]