Client data for JPMorgan Chase (JPM.N), opens new tab, Citi (C.N), opens new tab, Morgan Stanley (MS.N), opens new tab and other major banks may have been accessed in a hack of a technology vendor, the New York Times reported on Saturday, citing people familiar with the matter.

SitusAMC said in a statement, opens new tab on its website on Saturday that it had been the subject of a cyberattack on November 12, compromising certain information from its systems and that “data relating to some of our clients’ customers may also have been impacted.”