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5Perp DEXNewJun 26, 2026

Polymarket Suffers $3M Frontend Supply-Chain Exploit; Pledges Full User Compensation

Polymarket suffered a $3 million theft via a supply-chain attack on its frontend through a compromised third-party vendor, with the platform pledging full compensation to affected users. The attacker accessed user wallets through the frontend vulnerability rather than exploiting on-chain smart contract code.

Story timeline · 7 days

  1. Jun 30, 20266
    CFTC Launches Broad Investigation Into Polymarket Covering Social Media and Wash Trading

    CFTC investigation scope expanded publicly to include social media activities and wash trading; separate CFTC probe expansion reported.

  2. Jun 29, 20265
    Polymarket Frontend Hack Total Confirmed at $3.1M From 11 Wallets; Refund Pledge Under Scrutiny

    Losses confirmed at $3.1M from 11 wallets; platform's refund pledge faces ongoing credibility scrutiny.

  3. Jun 28, 20264
    Polymarket Faces Formal CFTC Investigation and Multi-State Scrutiny

    CFTC probe now described as formal investigation alongside multi-state pressure, extending prior reporting on regulatory scrutiny and fake bets allegations.

  4. Jun 28, 20265
    Prediction Market Weekly Volume Hits $14.4B Record for Third Consecutive Week

    Prediction market trading volume rose to $14.4B in weekly volume, hitting a record for the third straight week according to a16z data.

  5. Jun 28, 20266
    Polymarket Frontend Hack Drains $3.1M From 11 Wallets

    Loss total confirmed at $3.1M across 11 wallets; platform pledged full refunds.

  6. Jun 27, 20265
    CFTC and Multiple US States Investigate Polymarket; Platform Reports $1B Annualized Revenue

    CFTC formal investigation launched with multiple US states and consumer groups simultaneously applying pressure; $1B annualized revenue milestone added.

  7. Jun 26, 20265· this story
    Polymarket Suffers $3M Frontend Supply-Chain Exploit; Pledges Full User Compensation

Sources · 6