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CRITICAL THREAT · Financial Fraud

Consumer Alert: Reported Fraud Vulnerabilities at Polymarket

Investigations in September 2026 revealed that Polymarket was the target of a significant fraud campaign starting in February 2026, involving attempted theft of at least $10 million via stolen credit cards and potential account takeovers.

10/9/2026Polymarket

Warning signs

  • High transaction rejection rates by payment processors
  • Unauthorized access to user accounts via stolen personal identification data
  • Loosening of anti-money laundering (AML) withdrawal safeguards
  • Platform-wide security vulnerabilities during high-volume periods

What you should do

  • Monitor bank and credit card statements for unauthorized transactions
  • Enable multi-factor authentication (MFA) on all financial and trading accounts
  • Use unique, strong passwords for every platform
  • Place a fraud alert on credit reports if personal information is suspected to be compromised
  • Research a platform's AML and security policies before depositing funds
Reports indicate that between February and July 2026, Polymarket faced severe security challenges. In February, the platform's payment processor, Checkout.com, flagged over 80% of deposits as fraudulent, suggesting a massive attempt to use the platform for money laundering. Furthermore, reports allege that internal safeguards, such as the requirement to withdraw funds to the original deposit source, were weakened during this period. A separate incident in July 2026 reportedly allowed unauthorized access to nearly 500 user accounts due to an engineering flaw. These events have prompted an investigation by the Commodity Futures Trading Commission (CFTC) into the platform's compliance and risk management practices.

Sources

https://www.theblock.co/post/317568/fraudsters-attempted-to-steal-at-least-10-million-through-polymarkets-us-platformhttps://news.bitcoin.com/report-polymarket-ignored-warnings-during-10m-fraud-attack/https://unchainedcrypto.com/polymarket-loosened-an-anti-laundering-rule-amid-10-million-stolen-card-attack/https://ground.news/article/stolen-card-fraud-hits-polymarket