Polymarket’s traders lost funds through a website supplier. How safe is the trading screen?

Polymarket’s October 29 breach reached traders through a compromised website supplier. Researchers found code that tried to use logged-in accounts to sell positions and move assets, exposing the trust traders place in the screen they use to manage their money. Polymarket confirmed a compromised provider and restored international trading after a 1-hour halt. Researchers linked the incident to a performance-monitoring script loaded by the website. The retrieved code sought access to the trading client and signer inside an active session. A separate vendor breach in June had already prompted a promise of full refunds.