Some customers of ADT security equipment may have Watch An Enticing Invitation Onlinehad personal information leaked onto the internet.

The home security giant acknowledged as much this week in an 8-K filing with the Securities and Exchange Commission (SEC), per BleepingComputer. Hackers apparently got into ADT's systems and stole limited customer information to post on a hacking forum.

"After becoming aware of the incident, the ompany promptly took steps to shut down the unauthorized access and launched an investigation, partnering with leading third-party cybersecurity industry experts," ADT's 8-K filing said.

According to ADT, the information that was leaked was limited to email addresses, phone numbers, and postal addresses. Without giving any hard numbers, ADT claimed that only a small percentage of its customers were affected by this hack.

BleepingComputer noted that data apparently stolen from ADT was posted on a hacking forum at the end of July. That data allegedly included customer user IDs and what products they had purchased from ADT. Companies are required to notify affected customers after data breaches in the U.S. and elsewhere, so if you were affected, you may hear from ADT soon, if you haven't already.