tl;dr: Scribd (parent of Slideshare, Everand, and Fable) notified users of a security breach in which an unauthorized third party accessed data including email addresses, last 4 digits of credit cards, card issuer, expiry date, and payment history. Scribd says the affected system has been secured, law enforcement and data protection authorities have been notified, and users should stay alert for phishing attempts. No evidence of misuse has been reported so far.