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Polymarket denies dark web breach claim as prediction markets face cyber and regulatory threats

Bitget • April 29, 2026

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Polymarket Denies Data Breach Claims Amid Dark Web Allegations Polymarket, a decentralized prediction market platform, faced allegations of a data breach after a hacker known as xorcat claimed to have extracted over 300,000 records, including personal user data and exploit code, from its systems. The hacker's post on a cybercrime forum suggested that the data was obtained through undocumented API endpoints and various vulnerabilities, including CORS misconfigurations and pagination bypass techniques. Polymarket refuted these claims, stating that the data was publicly accessible via its APIs and on-chain records, characterizing the hacker's actions as mere scraping rather than a breach. The platform also highlighted its active bug bounty program, launched on April 16, 2026, contradicting the hacker's assertion that it lacked such a program. Security experts expressed skepticism about the breach, noting that the information cited by the hacker was already available to developers. The situation reflects ongoing tensions in the crypto space regarding data transparency and security. As of now, Polymarket maintains that no unauthorized access occurred. 9 sources 55

Polymarket denies dark web breach claim as prediction markets face cyber and regulatory threats

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