Polymarket Confirms $3 Million Drained From 11+ Users in Third-Party Vendor Breach

According to Peckshield, hackers drained approximately $3 million from more than 11 Polymarket users in June through a compromised third-party vendor. The attackers injected malicious frontend code that prompted users to approve fraudulent transactions, emptying their connected wallets. Polymarket confirmed the incident was a supply-chain attack targeting an external supplier rather than the platform's core infrastructure, and stated it is refunding affected users in full.
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