Scam ads in AT&T Yahoo Mail posed as Microsoft security alerts

Sponsored messages in the AT&T edition of Yahoo Mail directed some readers to a fake Microsoft security warning that urged them to call a support number. Researchers traced two scam operations running through the same ad slot on October 7 and 8, 2026, with one also appearing in a Taboola ad on September 24. The scam kit behind one of the ads was found on 536 cloud hostnames between July 12 and October 10, 2026, along with 160 phone numbers. The fraudulent content appeared only for visitors arriving through fresh ad clicks on home broadband and mobile connections, while visits from data centers received unrelated articles. Taboola, which sells native ads across Yahoo's sites, has not been reported as responding to the findings in this account.
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