In a statement to customers, the site said:
"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 with the subject as "Action Required: Update Your PDF Application" and containing a link to update an Adobe Acrobat PDF application. Please do not click this link, but delete the email.
"We have taken immediate action ...
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