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The former security chief of WhatsApp has accused the messaging app’s parent company Meta of violating cyber security regulations and putting billions of users at risk.

Attaullah Baig, who joined the company in 2021 before his contract was terminated in 2025, filed a lawsuit with the US District Court for the Northern District of California on Monday alleging that Meta dismissed security issues to instead prioritise user growth.

The lawsuit claims that WhatsApp , which has more than 3 billion users worldwide, failed to address the hacking and takeover of more than 100,000 accounts each day.

The 115-page document also alleges that around 1,500 engineers at WhatsApp and Meta could access sensitive user in

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