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What we know so far: Hackers took over Staples customer-service sessions and used them to issue more than 15,000 gift cards worth over $5 million, according to a newly unsealed search warrant application. The breach linked a corporate software intrusion to an organized retail theft operation, letting the group turn unauthorized system access into merchandise. It also exposed how weaknesses in one company's internal tools could support fraud across multiple retailers.

The attackers obtained the session data from the memory of a support application the retailer believed could only be reached from its own computers. The breach gave a Chinese organized crime group a way to generate gift cards for retailers including Target and Sephora.…