Ticketweb hacked, email compromised

Online ticket sales site Ticketweb, a subsidiary of Ticketmaster in the UK, sent this email to all users over the weekend:

We have discovered that our TicketWeb UK direct email marketing system was exposed to unauthorised access. As a result, you may have received up to four emails on Saturday, February the 11th, from an unauthorised party.

The email in question posed as an Adobe newsletter, but linked to a phishing scam. The email goes on:

We have taken immediate action to close the vulnerability. You can rest assured that none of your credit card information was vulnerable during this attack.

It's not clear if the database was extracted and then used, or if access to their legitimate email systems was gained illegitimately and a scam sent.