Acer has quietly informed the California attorney general that its online store was attacked by hackers.

In a letter dated Wednesday, the Taiwanese technology giant admitted that an unauthorized outside party had taken a year's worth of full credit card data, names and addresses between mid-May 2015 and late-April this year.

The company said it hasn't found any evidence yet that passwords or logins were affected, but didn't outright rule it out.

An Acer spokesperson said the company has notified all 34,500 customers whose data was taken -- all of which are based in the US, Canada, and Puerto Rico.

It's not thought to be related to a recent spate of "mega breaches," which included MySpace, LinkedIn, and Tumblr, which all suffered at the hands of historical hacks, leaking millions of accounts.

Earlier this week, Canadian media giant VerticalScope admitted it over 1,100 of its forums had been hacked, leaking close to 45 million users' details, including email addresses and passwords.