Comcast customers are being told to reset their password and account information after the company discovered that information was being sold online.
About 200,000 customers could be affected, Comcast said.
The stolen information did not come from a data breach, but was taken during previous malware attacks, phishing scams and other third party attacks.
Comcast customers warned to change passwords
More TOP STORIES News
Ministers call for wider investigation into death of teen shot by homeowner during attempted car theft