CISA has warned that state-backed snoops and cyber-mercenaries are actively abusing commercial spyware to break into Signal and WhatsApp accounts, hijack devices, and quietly rummage through the phones of what the agency calls "high-value" users.

In an alert published Monday , the US government's cyber agency said it's tracking multiple miscreants that are using a mix of phishing, bogus QR codes, malicious app impersonation, and, in some cases, full-blown zero-click exploits to compromise messaging apps which most people assume are safe.

The agency says the activity it's seeing suggests an increasing focus on "high-value" individuals – everyone from current and former senior government, military, and political officials to civil society groups across the US, the Middle East, and Europe.

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