HLTV.org is arguably the home for all Counter-Strike 1.6 and CS:GO news, updates, reports, event coverage, announcements, professional player analysis and more. In a recent blog post they've reported a security breach has taken place.
Thankfully there is no user-stored financial information on this website, so all that has been compromised is your personal profile - however if you're like many and use the same password for multiple websites, you might want to act quickly.
The post went on to explain that the admins "have auto logged out everyone, so no sessions can be stolen that way, so that is why you are prompted to re-login the next time your session expire." HLTV recommends that all users change their passwords immediately.