Multiple Polymarket users reported unauthorized asset transfers on October 30, with suspected front-end attacks draining funds from several accounts. Trader Car disclosed approximately $800,000 stolen from their account and all positions liquidated, while a friend's account lost around $600,000. Other users reported losses of up to $200,000 and received unauthorized withdrawal signature requests through the official website. Affected traders urged users to lock their accounts and avoid interacting with Polymarket until the situation is resolved. As of press time, Polymarket has not issued an official response regarding the incident. This marks the second security breach for Polymarket in 2026. In June, a front-end phishing attack following a third-party vendor compromise resulted in approximately $2.94 million in user assets being stolen.