GoToMyPC has been targeted with "very sophisticated password attack," and is advising all users to reset their passwords.
In a statement on its website, Citrix, which owns the remote control service, said users will be required to reset your GoToMyPC password before they can login again and encourages users to use two-factor authentication.
"We sincerely apologize for the inconvenience and frustration this issue may be causing," Citrix said.
The company didn't confirm the number of passwords it believes are stolen or what other information the hackers may have, as it's still investigating the hack.
We have reached out to Citrix for more information and will keep you updated.
GoToMyPC's hack follows an alleged attack on TeamViewer, who offers a similar product.
TeamViewer said while it was not at fault, users reported PC hijacking to accounts being accessed for the purpose of making purchases ranging from designer clothes to gift cards.