The consequences are alarming. Imagine a business traveller trying to check out of a hotel in the future, all ready to board a flight, and finding that his or her credit limit has been reached (by criminal misuse of his card) and left without the means to settle the bill.
Until more details of this story emerge and we see a statement by Best Western Hotels detailing the extent of the penetration, it may be advisable for travellers who think they have been exposed to ask their card issuer to cancel their credit card and issue a replacement card with a different number.
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http://www.ibls.com/internet_law_news_portal_view.aspx?s=sa&id=1369