Dentsu confirms a data breach at its U.S. subsidiary Merkle, exposing employee and client data.

The attack prompted system shutdowns and an ongoing investigation, with no ransomware claim as of now.

Merkle’s client roster includes Microsoft, Nestlé, Hilton, and 7-Eleven - underscoring how supply chain risk extends deep into data-driven marketing.

How should agencies handling global consumer data improve their cyber resilience?
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