The AP Stylebook, a writing and editing guide that is widely used by corporations and newsrooms, is hosted on apstylebook.com. However, an older version was until recently also available, on stylebooks.com. This older version, which a third party had maintained on behalf of AP, was no longer in use, but it was still accessible.
Threat actors hacked into the old site and managed to obtain the information of more than 220 customers, including their name, postal address, email address, phone number, and user ID. In some cases, customers also provided social security numbers or taxpayer IDs, which may have also been stolen by hackers.