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Polymarket resumes trading after third-party security breach, to reimburse users

The company said it will reimburse affected traders after a compromised vendor let malicious code drain wallets and forced a temporary trading halt.

  • On Thursday, Polymarket halted trading on its international platform for nearly an hour after malicious code served through its website caused users to report losing more than $2 million.
  • DebugBear, a UK-based analytics company, confirmed it is aware of the 'ongoing security incident' after its code was exploited to gather trading credentials from user local storage.
  • Blockchain analysis group Arkham reported some $2.65 million in cryptocurrencies were siphoned from the platform before trading resumed at 3 p.m. ET.
  • Polymarket pledged to 'make whole' any impacted users and has referred the matter to relevant law enforcement, the company said.
  • Head of global intelligence and investigations Shana Bautista noted the company is investigating 'dozens' of issues related to the U.S. midterms as prediction markets face continued insider-trading threats.
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(Seoul = Yonhap News) Reporter Jung Joo-ho = Hackers exploited a flaw in the website of the U.S. prediction market platform Polymarket to steal at least $2.6 million (approximately 35...) from user accounts.

·Seoul, Korea (the Republic of)
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Bozeman Daily ChronicleBozeman Daily Chronicle
+17 Reposted by 17 other sources
Center

Polymarket paused international trading after a security issue involving a third-party provider

Polymarket temporarily halted trading on its international platform Thursday due to a security incident involving a third-party provider. Trading resumed after about an hour. The prediction market platform paused trading "out of an abundance of caution" after identifying the issue,…

·Cherokee County, United States
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The Business Journal broke the news on Thursday, October 29, 2026.
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