Polymarket Says Third-Party Vendor Breach Led to About $3 Million in User Losses

Polymarket said a compromised third-party vendor injected malicious code into its website, and blockchain security firm PeckShield estimated that hackers stole roughly $3 million from users. According to NS3.AI, Polymarket said it has contained the breach and will refund affected users in full. The company attributed the incident to a third-party vendor compromise that enabled the malicious code injection.