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

May 22, 2026

< 1 min read

by Coin Edition

for CoinEdition

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

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On May 22, 2026, crypto on-chain investigator ZachXBT reported that Polymarket's UMA Conditional Token Framework (CTF) adapter on Polygon was exploited, with attackers draining over $520,000 primarily in POL tokens and USDC.e. The breach resulted from a compromised old private key tied to an internal operations wallet, raising immediate DeFi security and prediction market trust concerns. The incident underscores risks for Polygon-based protocols and UMA integrations and may hurt adoption and custody confidence.

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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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