Those of you who use Citrix's GoToMyPC are going to have to reset your passwords. The service, which lets users remotely access PCs over the internet, was hit by a "very sophisticated password attack," Citrix said in a blog post. The company is requiring users to reset their passwords using the "forgot password" link.

Cyberattacks against websites have jumped in recent years as hackers find new ways to exploit security flaws. Hackers often sell stolen customer credentials on the black market. Users typically are prompted to reset their passwords but still have to worry about their personal information winding up in the wrong hands.