A Magecart card-skimming campaign this month sabotaged the mobile websites of two hotel chains by executing a supply chain attack on a third-party partner, researchers have reported.

The third party in both instances was Roomleader, a Barcelona-based provider of digital marketing and web development services. One of the ways Roomleader helps hospitality companies build out their online booking functionality is through a library module called "viewedHotels," which saves viewed hotel information in visitors' browser cookies.

Both of the affected hotel chains implemented this module, which the adversaries had infected with malicious JavaScript after first compromising Roomleader, according to Trend Micro, whose researchers discovered the attacks and disclosed them in a company blog post today. The lodging chains were not named, but one has 107 hotels in 14 countries and the other has 73 hotels in 14 countries.

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