GM Says Some Online Accounts Hacked, Exposing Personal Info

Hackers compromised some online accounts of General Motors Co. customers in April, potentially accessing addresses, phone numbers and other personal information, according to a data breach notice filed with California regulators.

In a letter to affected customers, GM said it identified suspicious login attempts to an unspecified number of accounts between April 11 and April 29. The intrusions allowed hackers in some cases to redeem gift cards using reward points.

It was unclear how many accounts were affected, although the California Attorney General’s Office reported that nearly 5,000 breach letters were sent to state residents. Social Security numbers and driver’s ...