--- title: "Polymarket users lose funds after security breach" publication: "MediaBias News" url: "https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach" api: "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" audio: "https://mediabias.news/api/audio/polymarket-users-lose-funds-after-security-breach" category: "Business & Economy" published: "2026-10-29T19:45:32.113Z" source_reported: "2026-10-29T19:26:00.000Z" updated: "2026-10-29T19:45:32.113Z" trust_score: 50 critic_score: 60 hype_score: 41 assessment_type: "coverage-and-source-reporting-analysis" fact_check_status: "not-performed" coverage_measured: "2026-10-29T19:44:10.759518+00:00" --- # Polymarket users lose funds after security breach *The prediction market platform halted trading and will reimburse affected users following a compromise of a third-party provider.* **Scores for the source reporting** (0-100, assessing the original journalism this article was written from, not this write-up): - Trust 50 of 100, higher is better. Two full reports and transaction records put the loss at around $2.6 million; other sources did not specify. - Craft 60 of 100, higher is better. The story is clearly written, but lacks quotes from affected users or the third-party provider. - Hype 41 of 100, lower is better. Headlines suggest a major attack, but the body details a contained incident with user funds to be reimbursed. Scored by MediaBias News; method at https://mediabias.news/methodology. **The short version** - 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. 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. ## Disagreement on the exact losses 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. ## What the coverage left out 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. ## Who covered it Shares of the 7 covering outlets with a published leaning rating: - Left: 29% (2) - Centre: 71% (5) - Right: 0% (0) 9 of 16 covering outlets carried no usable leaning rating and were excluded from those percentages. Coverage measured 2026-10-29T19:44:10.759518+00:00. **Coverage watch:** developing. Checked 2 times; 0 checks found a material change. Most recently checked 2026-10-29T20:15:25.057Z. ## How the sides framed it ### 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 No separate framing summary. ## Factuality profile of the covering outlets These are published factuality ratings of the outlets, not a verdict on whether this story or its claims are true. - high: 3 - unknown: 9 - veryHigh: 4 ## Verification scope This page compares coverage and scores the source reporting. It is not a ClaimReview verdict on whether the underlying event or claim is true. ## Original reporting this was written from - [Reuters](https://reuters.com/business/polymarket-reports-major-outage-suspends-trading-actions-2026-10-29) — Polymarket resumes trading after third-party security breach, to reimburse users - [Forbes](https://forbes.com/sites/conormurray/2026/10/29/polymarket-fully-reimbursing-users-after-halting-international-trading-amid-compromised-third-party-provider) — Polymarket 'Fully Reimbursing' Users After Halting International ... - [Gândul](https://gandul.ro/actualitate/polymarket-atac-cibernetic-trader-paguba-21049432) — The Famous Polymarket Political Betting Platform Was Targeted by a Cyber Attack. A User Would Have Lost $800,000 - [BITRSS](https://bitrss.com/polymarket-pauses-trading-as-prediction-market-investigates-security-incident-266457) — Polymarket Pauses Trading as Prediction Market Investigates Security Incident - [Coin Desk](https://coindesk.com/markets/2026/10/29/polymarket-suspends-trading-after-third-party-breach-leads-to-user-losses) — Polymarket suspends trading after third-party breach leads to user ... - [NBC News](https://nbcnews.com/business/consumer/polymarket-trading-halt-hack-wallets-rcna606405) — Polymarket trading halted after vendor compromise; impacted users will be ‘made whole’ - [Bloomberg](https://bloomberg.com/news/articles/2026-10-29/polymarket-halts-trading-after-reports-of-customers-losing-money) — Polymarket Trading Halted After Reports of Stolen Funds - [DiarioBitcoin](https://diariobitcoin.com/exchanges/polymarket-suspende-operaciones-tras-reportes-de-retiros-no-autorizados) — Polymarket Suspends Operations After Unauthorized Withdrawal Reports - [coinotag.com](https://coinotag.com/polymarket-ucuncu-taraf-ihlali-islemler-durdu) — Polymarket Halts Operations Following Third-Party Breach - [SpaceMoney](https://spacemoney.com.br/investimentos/criptomoedas/polymarket-pausa-negociacoes-incidente) — Polymarket Says It Will Replenish Users After Incident - [BNO News](https://bnonews.com/index.php/2026/10/some-polymarket-users-report-losing-funds-after-security-breach) — Some Polymarket users report losing funds after security breach - [BizToc](https://biztoc.com/x/c93f5492c82f3095) — Polymarket reports outage on international exchange, halts trading - [CNBC](https://cnbc.com/2026/10/29/polymarket-reports-outage-on-international-exchange-halts-trading.html) — Polymarket reports outage on international exchange, halts trading - [Decrypt](https://decrypt.co/382185/polymarket-pauses-trading-prediction-market-security-incident) — Polymarket Pauses Trading as Prediction Market Investigates Security Incident - [Livecoins](https://livecoins.com.br/polymarket-pausa-negociacoes-e-diz-estar-investigando-incidente-de-seguranca) — Polymarket Pauses Negotiations and Claims to Be Investigating Security Incident - [Crypto Briefing](https://cryptobriefing.com/polymarket-security-issue-third-party-breach) — Polymarket resolves security issue after third-party breach ## Questions **What happened to Polymarket users?** 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. The platform has promised to refund all affected users. **How much money was lost?** Transaction records indicated losses of around $2.6 million. However, the exact amount was not immediately clear, with some reports stating the precise figure had not yet been disclosed and another citing one user losing $800,000. **What caused the security breach?** Polymarket attributed the incident to a compromised third-party provider named DebugBear. Malicious code from DebugBear was served through Polymarket's website, which was then used to gather information about active users and exploit trading credentials. --- MediaBias News — https://mediabias.news. Reproduced from https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach. Please cite as: MediaBias News, "Polymarket users lose funds after security breach", https://mediabias.news/business/polymarket-users-lose-funds-after-security-breach