Hackers stole three million dollars from Polymarket users through a compromised third-party vendor

https://media.thenextweb.com/2026/06/polymarket-hack-3-million-stolen-third-party-breach.avif

TL;DR

Hackers drained roughly three million dollars from Polymarket users via a compromised vendor that injected malicious code into its frontend.

Polymarket confirmed on Thursday that hackers stole funds from users after a third-party vendor was compromised, allowing malicious code to be injected into the prediction market’s website. Blockchain monitoring firm PeckShield estimated the losses at roughly three million dollars worth of cryptocurrency, drained from more than 11 victims.

The company said in a post on X that it had “contained” the incident and removed the affected dependency. Polymarket said it is contacting victims and “refunding them in full,” though it did not specify how many users were affected or name the compromised vendor.

Polymarket spokesperson Connor Brandi confirmed to TechCrunch that the breach led to funds being stolen but declined to provide additional details. The company did not respond to specific questions about the incident.

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