A serious issue; Millions of customers impacted after AT&T weekend data breach WHIO TV 7 and WHIO Radio [Video]

OHIO — Several AT&T customers may be impacted after a massive data breach over the weekend.

>>RELATED: AT&T says a data breach leaked millions of customers’ information online. Were you affected?

The telecommunications giant said Saturday that a dataset found on the “dark web” contained information such as Social Security numbers for about 7.6 million current AT&T account holders and 65.4 million former account holders, the Associated Press reported.

Technology experts say past and present users should act now to protect their data.

“This is quite a serious issue,” said Glenn Gerstell, former NSA General Counsel.

The company said in a statement it is investigating how information from 73 million customers got onto the dark web and has notified those that have been affected.

>>RELATED: AT&T notifies users of data breach and resets millions of passcodes

“If you’re not notified, just don’t assume automatically that you’re safe,” said Gerstell. “You need to investigate …