Prediction markets platform Polymarket has denied current studies that its buyer knowledge was breached after a hacker on the darkish internet posted what the particular person claimed was a trove of personal person particulars.
Cybersecurity firm Vecert Analyzer and a number of other different X accounts that monitor darkish internet exercise shared screenshots from DarkForums on Tuesday exhibiting a hacker utilizing the pseudonym “xorcat” claiming to have breached Polymarket.
Within the submit, xorcat stated they’d stolen over 300,000 information, together with 10,000 distinctive person profiles with full names, profile pictures, proxy wallets and base addresses.
Polymarket referred to as the claims of an information breach “full and utter nonsense” and stated the knowledge the hacker posted is already obtainable on-line.
The crypto business noticed a sudden surge in crypto-related hacks and exploits in April, placing many within the house on excessive alert. Blockchain safety firm Hacken reported earlier this month that Web3 initiatives misplaced $482 million to hacks and scams within the first quarter of 2026 throughout 44 incidents.
“You compromised our platform by accessing publicly accessible API endpoints & on-chain knowledge and *checks notes* are attempting to promote the information we provide builders totally free? Which VC paid you to submit this?” Polymarket stated.
In one other submit, the prediction market stated: “A part of the great thing about being on chain is all our knowledge is publicly auditable, it is a function, not a bug. No knowledge was leaked, it is accessible through our public endpoints & on-chain knowledge. As an alternative of paying for the information, you possibly can entry it totally free through our APIs.”
Supply: Polymarket
Hacker claims over 300,000 information stolen
The so-called hacker stated the information was being posted as a result of Polymarket didn’t have a bug bounty program.
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Nevertheless, Polymarket has a dwell bug bounty program that began April 16 and has acquired 446 studies as of Wednesday.
Supply: Darkish Internet Informer
Xorcat additionally stated knowledge was pulled through undocumented API endpoints, pagination bypass and CORS misconfiguration on Polymarket’s Gamma and CLOB APIs. The hacker claimed to have breached different prediction markets and deliberate to launch the information over the following few days.
A number of safety consultants have expressed doubt. Vladimir S, a menace researcher and chief safety officer at Legalblock, stated it seems “somebody parsed knowledge and is attempting to current it as a [DB] leak. It doesn’t appear possible to me.”
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