Polymarket’s UMA CTF Adapter Contract on Polygon Exploited Over $520K

• ZachXBT said Polymarket’s UMA CTF contract on Polygon was exploited for over $520K.
• The attacker compromised an old private key belonging to an internal Polymarket operations wallet.
• This incident raises fresh prediction market security concerns and may impact user trust in Polymarket.

On May 22, 2026, prominent on-chain investigator ZachXBT warned that Polymarket’s Universal Market Access (UMA) Conditional Token Framework (CTF) Adapter contract on Polygon was likely exploited in a major security breach, with attackers draining more than $520,000 from the linked addresses so far, primarily POL tokens and USDC.e.

ZachXBT Flags Over $520K Suspected Polymarket UMA Contract Exploit

ZachXBT flagged suspicious activity involving Polymarket’s UMA CTF Adapter contract deployed on Polygon. Community reports and on-chain data indicated that more than $520,000, prima…

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