Polymarket investigates $520K-$700K in unauthorized POL outflows from a compromised six-year-old private key, confirming user funds and smart contracts remain safe.

Onchain sleuth ZachXBT flagged a potential exploit of Polymarket's UMA CTF Adapter on Polygon, with $520K reportedly drained so far.

ZachXBT said that Polymarket’s UMA smart contract has been exploited for at least $520,000, pointing to an attacker address receiving hundreds of small transactions.