Hackers Stole $2.7M From Polymarket Traders—Here's What Went Wrong

Michael Miller · 2026-11-01

You know that feeling when you check your crypto wallet and something's off? For 726 Polymarket traders, that feeling hit hard on October 29. Hackers didn't just poke around—they actually sold users' positions and funneled the money straight into their own pockets. And the way they did it? Sneaky as hell. ### The Trojan Horse: A Hijacked DebugBear Script Polymarket, a prediction market where people bet on everything from elections to sports, loaded a page-speed script from an outside company called DebugBear. Somewhere along the line, that script got swapped out for malicious code. So when signed-in traders visited the site, the code quietly executed trades—selling their positions and moving the funds to the attackers. No phishing email, no shady download. Just a compromised third-party script doing the dirty work. ### The Fallout: $2.7 Million in Refunds Polymarket didn't waste time. They've promised to refund about $2.7 million to the affected wallets. Blockchain records show that roughly $2.64 million in crypto actually reached the hackers, so the platform is eating the difference to make users whole. That's a hefty hit, but it's the right move if you want to keep trust alive. ### What This Means for Antidetect Browser Users If you're using an antidetect browser for multi-accounting or privacy, this story should ring alarm bells. Third-party scripts are a weak link you can't always control. But here's the thing: the best antidetect browser setups isolate your sessions, so even if one profile gets compromised, the damage doesn't spread. Still, no tool can protect you from a site that's been hacked. - **Always check script sources:** If a site loads code from an external domain, that's a potential entry point. - **Use isolated profiles:** Antidetect browsers let you separate identities, so a breach on one account doesn't leak to others. - **Stay updated:** Keep your browser and extensions patched—hackers love outdated software. > "The most secure system is only as strong as its weakest third-party script." — Anonymous security researcher ### How to Protect Yourself First, assume nothing. Even trusted platforms can get hit. Use a reputable antidetect browser to compartmentalize your activities. If you're managing multiple accounts, don't reuse passwords or sessions. And keep an eye on your wallet balances—if something looks off, act fast. Polymarket's quick refund is a good sign, but not every platform will do that. The best defense is prevention. So next time you log into a trading site, ask yourself: do I really know what scripts are running behind the scenes? Stay safe out there.