Coinbase's stock (COIN) fell by more than 8% Thursday after two developments that raised new questions about the company's controls and regulatory headaches. First the US crypto exchange disclosed that cyber attackers had stolen sensitive customer data and threatened to publish it unless the company paid a $20 million ransom.

According to a filing with the Securities and Exchange Commission (SEC) on Thursday, "an unknown threat actor" contacted the crypto exchange giant on May 11, informing it of the stolen data and "demanded money in exchange for not publicly disclosing the information."

Crypto exchange Coinbase has disclosed a significant cyber attack that could cost the company between $180m (£135m) and $400m (£300m), after hackers breached account data belonging to a “small subset” of its users.

Coinbase CEO Brian Armstrong said on X that the crypto exchange had been targeted in a sophisticated extortion attempt involving insider collusion and customer data theft. Armstrong said hackers tried to bribe Coinbase’s overseas customer support agents for access to internal tools,

Coinbase saw its largest share price spike since Donald Trump's election win this week - but was rocked today following a cyber-attack.

Coinbase Users Reassured After $400M Breach on the crypto trading platform with a $20 million ransom demand from the attackers

Coinbase, the leading US crypto exchange, faced a cyber attack involving bribed overseas customer support agents. Hackers demanded a $20 million ranso

Coinbase has revealed an insider-driven data breach impacting under 1% of active users; no funds lost, and a $20M reward offered for leads.

Coinbase on Thursday said criminals bribed and duped their way to stealing cryptocurrency from its users, then tried to blackmail the exchange to keep the crime quiet.