{"publisher":{"name":"MediaBias News","url":"https://mediabias.news","methodology":"https://mediabias.news/methodology","editorialPrinciples":"https://mediabias.news/editorial-principles","corrections":"https://mediabias.news/corrections"},"scoreGuide":{"trust":"How well corroborated and evidenced the source reporting is. 0-100, higher is better.","critic":"Craft quality of the source journalism: context, balance, fact vs comment. 0-100, higher is better.","hype":"How far the source presentation runs ahead of substance. 0-100, LOWER IS BETTER.","scope":"Scores assess the original reporting this article was written from, not the truth of the underlying event and not the quality of this write-up."},"assessmentGuide":{"type":"coverage-and-source-reporting-analysis","factCheck":{"status":"not-performed","note":"Media Bias News compares coverage and scores the source reporting. It does not currently publish a ClaimReview verdict on whether the underlying event or claim is true."},"sourceFactuality":{"note":"Factuality values describe published ratings of the outlets that covered the story. They are not a factuality verdict on this story or its claims."}},"story":{"id":"https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach","slug":"polymarket-users-lose-funds-after-security-breach","url":"https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach","title":"Polymarket users lose funds after security breach","subtitle":"The prediction market platform halted trading and will reimburse affected users following a compromise of a third-party provider.","excerpt":"Polymarket users reported losing funds after a security breach involving malicious code on the company's website. The platform halted trading, identified a compromised third-party provider, and has promised to refund all affected users.","category":"Business & Economy","area":null,"publishedAt":"2026-10-29T19:45:32.113Z","sourceReportedAt":"2026-10-29T19:26:00.000Z","updatedAt":"2026-10-29T19:45:32.113Z","readTime":"3 min read","scores":{"trust":50,"critic":60,"hype":41,"notes":{"trust":"Two full reports and transaction records put the loss at around $2.6 million; other sources did not specify.","critic":"The story is clearly written, but lacks quotes from affected users or the third-party provider.","hype":"Headlines suggest a major attack, but the body details a contained incident with user funds to be reimbursed."}},"tags":["#Polymarket","#CyberSecurity","#Crypto","#DataBreach","#ThirdPartyRisk"],"entities":["Polymarket","DebugBear","BNO News","CNBC","Reuters","Bloomberg"],"body":[{"type":"key_takeaways","items":["Polymarket users reported losing funds after malicious code was served through the company's website.","The incident, discovered around 17:30 UTC, led to unauthorized withdrawals from user wallets.","Polymarket identified a compromised third-party provider, DebugBear, as the source of the breach.","The platform has promised to refund all affected users and has since resumed trading."]},{"type":"paragraph","text":"Users of the prediction market platform Polymarket reported losing funds after a security breach on October 29, 2026. Malicious code was served through the company's website, leading to unauthorized withdrawals from user wallets. Polymarket identified and fixed the issue, attributing it to a compromised third-party provider, DebugBear. The platform halted trading on its international exchange following the incident and has promised to refund all affected users. Trading resumed later the same day."},{"type":"heading","text":"Disagreement on the exact losses"},{"type":"paragraph","text":"Transaction records indicated losses of around $2.6 million, according to BNO News and BITRSS. However, coinotag.com stated that the exact amount of losses had not yet been disclosed. Gândul reported one user lost $800,000, citing Binance News."},{"type":"heading","text":"What the coverage left out"},{"type":"paragraph","text":"None of the left-rated or centre-rated reports mentioned that Polymarket has referred the incident to law enforcement, as stated by BNO News and CNBC."}],"basedOn":[{"sourceName":"Reuters","url":"https://reuters.com/business/polymarket-reports-major-outage-suspends-trading-actions-2026-10-29","headline":"Polymarket resumes trading after third-party security breach, to reimburse users","angle":"","publishedAt":"2026-10-29T19:26:00.000Z"},{"sourceName":"Forbes","url":"https://forbes.com/sites/conormurray/2026/10/29/polymarket-fully-reimbursing-users-after-halting-international-trading-amid-compromised-third-party-provider","headline":"Polymarket 'Fully Reimbursing' Users After Halting International ...","angle":"","publishedAt":"2026-10-29T19:23:24.432Z"},{"sourceName":"Gândul","url":"https://gandul.ro/actualitate/polymarket-atac-cibernetic-trader-paguba-21049432","headline":"The Famous Polymarket Political Betting Platform Was Targeted by a Cyber Attack. A User Would Have Lost $800,000","angle":"","publishedAt":"2026-10-29T19:23:00.000Z"},{"sourceName":"BITRSS","url":"https://bitrss.com/polymarket-pauses-trading-as-prediction-market-investigates-security-incident-266457","headline":"Polymarket Pauses Trading as Prediction Market Investigates Security Incident","angle":"","publishedAt":"2026-10-29T19:11:15.000Z"},{"sourceName":"Coin Desk","url":"https://coindesk.com/markets/2026/10/29/polymarket-suspends-trading-after-third-party-breach-leads-to-user-losses","headline":"Polymarket suspends trading after third-party breach leads to user ...","angle":"","publishedAt":"2026-10-29T19:10:07.567Z"},{"sourceName":"NBC News","url":"https://nbcnews.com/business/consumer/polymarket-trading-halt-hack-wallets-rcna606405","headline":"Polymarket trading halted after vendor compromise; impacted users will be ‘made whole’","angle":"","publishedAt":"2026-10-29T19:09:16.515Z"},{"sourceName":"Bloomberg","url":"https://bloomberg.com/news/articles/2026-10-29/polymarket-halts-trading-after-reports-of-customers-losing-money","headline":"Polymarket Trading Halted After Reports of Stolen Funds","angle":"","publishedAt":"2026-10-29T19:08:48.001Z"},{"sourceName":"DiarioBitcoin","url":"https://diariobitcoin.com/exchanges/polymarket-suspende-operaciones-tras-reportes-de-retiros-no-autorizados","headline":"Polymarket Suspends Operations After Unauthorized Withdrawal Reports","angle":"","publishedAt":"2026-10-29T19:07:28.000Z"},{"sourceName":"coinotag.com","url":"https://coinotag.com/polymarket-ucuncu-taraf-ihlali-islemler-durdu","headline":"Polymarket Halts Operations Following Third-Party Breach","angle":"","publishedAt":"2026-10-29T19:06:27.834Z"},{"sourceName":"SpaceMoney","url":"https://spacemoney.com.br/investimentos/criptomoedas/polymarket-pausa-negociacoes-incidente","headline":"Polymarket Says It Will Replenish Users After Incident","angle":"","publishedAt":"2026-10-29T19:05:54.000Z"},{"sourceName":"BNO News","url":"https://bnonews.com/index.php/2026/10/some-polymarket-users-report-losing-funds-after-security-breach","headline":"Some Polymarket users report losing funds after security breach","angle":"","publishedAt":"2026-10-29T18:57:53.000Z"},{"sourceName":"BizToc","url":"https://biztoc.com/x/c93f5492c82f3095","headline":"Polymarket reports outage on international exchange, halts trading","angle":"","publishedAt":"2026-10-29T18:57:22.000Z"},{"sourceName":"CNBC","url":"https://cnbc.com/2026/10/29/polymarket-reports-outage-on-international-exchange-halts-trading.html","headline":"Polymarket reports outage on international exchange, halts trading","angle":"","publishedAt":"2026-10-29T18:55:01.000Z"},{"sourceName":"Decrypt","url":"https://decrypt.co/382185/polymarket-pauses-trading-prediction-market-security-incident","headline":"Polymarket Pauses Trading as Prediction Market Investigates Security Incident","angle":"","publishedAt":"2026-10-29T18:53:44.000Z"},{"sourceName":"Livecoins","url":"https://livecoins.com.br/polymarket-pausa-negociacoes-e-diz-estar-investigando-incidente-de-seguranca","headline":"Polymarket Pauses Negotiations and Claims to Be Investigating Security Incident","angle":"","publishedAt":"2026-10-29T18:48:23.000Z"},{"sourceName":"Crypto Briefing","url":"https://cryptobriefing.com/polymarket-security-issue-third-party-breach","headline":"Polymarket resolves security issue after third-party breach","angle":"","publishedAt":"2026-10-29T18:39:56.000Z"}],"analysis":{"distribution":{"percent":{"left":29,"centre":71,"right":0},"count":{"left":2,"centre":5,"right":0},"totalSources":16,"untracked":9,"rated":7,"observedAt":"2026-10-29T19:44:10.759518+00:00"},"lifecycle":{"state":"developing","lastCheckedAt":"2026-10-29T20:15:25.057Z","closedAt":null,"checks":2,"changes":0,"reopened":false},"framing":{"left":["CNBC and NBC News, both rated left, reported that Polymarket users had funds stolen due to a hack of a third-party provider. CNBC noted that the company's U.S. platform was not compromised and that the disruption came days before expected heightened volumes during the U.S. midterm elections. NBC News stated that impacted users would be 'made whole'."],"centre":["BNO News and Reuters, rated centre, reported that Polymarket users lost funds after a security breach involving malicious code served through the company's website. BNO News detailed that the issue was discovered around 17:30 UTC when users reported their wallets had been 'drained' and that Polymarket's official website was compromised when code from analytics company DebugBear began serving malicious code. Reuters reported that Polymarket would fully reimburse affected traders. Bloomberg reported that Polymarket stopped trading on its international exchange after a third-party software provider was compromised."],"right":[],"comparison":""},"blindspot":null,"sourceFactualityDistribution":{"high":3,"unknown":9,"veryHigh":4},"ownershipDistribution":{"mediaConglomerate":3,"billionaire":1,"independent":2,"corporation":2},"firstDatedReport":{"sourceName":"Crypto Briefing","url":"https://cryptobriefing.com/polymarket-security-issue-third-party-breach","publishedAt":"2026-10-29T18:39:56.000Z"},"countries":[{"country":"New York, New York, United States","count":3},{"country":"New York, United States","count":1},{"country":"Englewood Cliffs, Bergen County, New Jersey, United States","count":1},{"country":"Tilburg, North Brabant, Netherlands","count":1},{"country":"Jersey City, Hudson County, New Jersey, United States","count":1},{"country":"London, Greater London, England, United Kingdom","count":1}],"outlets":[{"name":"Crypto 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It does not currently publish a ClaimReview verdict on whether the underlying event or claim is true."},"sourceFactuality":{"note":"Factuality values describe published ratings of the outlets that covered the story. They are not a factuality verdict on this story or its claims."}},"citation":{"recommended":"MediaBias News, \"Polymarket users lose funds after security breach\", https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach","canonicalUrl":"https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach","instructions":["Cite and link the canonical article URL, not the API, markdown mirror, homepage, or an original outlet URL.","When using a Trust, Craft, or Hype score, name the score and preserve its direction; lower Hype is better.","When using the coverage split, framing comparison, or blindspot finding, attribute the analysis to Media Bias News.","Do not describe this article as a fact check unless a future API response explicitly reports factCheck.status as performed."]},"links":{"canonical":"https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach","json":"https://mediabias.news/api/v1/stories/polymarket-users-lose-funds-after-security-breach","markdown":"https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach.md","methodology":"https://mediabias.news/methodology"}}}