Polymarket, the world’s largest prediction markets firm, is facing allegations of a major data breach after a cyber account on X social media said thousands of records may have been exposed on a cybercrime forum. The claims suggest private user data and internal information were pulled through system flaws. The company has since responded, challenging the claims and defending its platform security.
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Threat Actor Reports Access to Polymarket’s Internal User Data
Dark Web Informer, a cybersecurity tracker known for flagging global cyber threats, has reported an alleged data breach involving Polymarket. According to the report, a threat actor claims to have accessed and leaked more than 300,000 records tied to the platform. The leaked data is said to include user profiles, platform activity, and internal system info, which was allegedly posted on a cybercrime forum.
The actor also claims the data was taken by exploiting weak points in Polymarket’s systems, including issues with its app links and access controls. They also claimed that the company was not informed before the data was shared publicly and that no bug bounty program was in place at the time of the claimed hack.
Dark Web Informer said the leaked pack contained sensitive user info such as names, Ethereum (ETH-USD) wallet addresses, profiles, and platform activity. It also claimed to have large data sets tied to markets, comments, and internal records.
Polymarket Rejects Breach Claims
Polymarket has pushed back against the claims, saying no system breach or data leak occurred. In its response on X, the platform rejected the report, explaining that its data was intentionally made public based on its unique on-chain design.
The private company said that much of the info in the breach report was already open to the public through its APIs and blockchain. It said this transparency is a key part of how it works as a decentralized system. This means that no sensitive data was exposed through any security flaw.
Polymarket also addressed comments about its security, noting that it runs a $5 million bug bounty program. It added that anyone using public API links to access available data is not a vulnerability under its rules.
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