Polymarket to Compensate Users Following $3 Million Theft

Summary

• Polymarket users lost around $3 million due to a security breach linked to a third-party vendor.
• The platform has assured that the issue is resolved and affected users will be fully compensated.
• This incident marks the second breach for Polymarket in a short span of two months.

Polymarket has confirmed that a significant hack occurred on its platform due to a vulnerability in a third-party vendor's system, leading to an estimated loss of $3 million for its users. The company has stated that it is working on reimbursing those affected.

While specific details about the vendor involved have not been disclosed, Polymarket noted that the breach allowed hackers to insert malicious code into the prediction market's front-end. The company did not provide further comments when contacted.

Investigations by Bubblemaps suggested that the breach mainly impacted fewer than 15 user accounts. The stolen funds, which were taken from wallets holding pUSD—a stablecoin used for trading—were converted into Ethereum and are currently in an untraceable wallet.

Some affected user accounts include:

0x349606c1b77F3Ba668879CbC9347f15a44cF8fc4
0xFB84a9d631A3a19204B82c78dFeb90b220255fB5
0x4aeC70021891EA712AAf3e2dD76c30f6b09A4ce9
0x987B441a20Dd4AA4bA6d53069E852E7f820adF43
0x2d7BE5170a8026c18709EAEa1027c7f12E8Ce2Ce…

— Bubblemaps (@bubblemaps) June 25, 2026

This latest breach follows another incident last month, where approximately $700,000 was stolen due to a compromised private key affecting a wallet used for employee rewards. Experts noted that this previous breach did not significantly impact the overall security of Polymarket's infrastructure.

These incidents underline the ongoing security challenges that companies face, particularly those relying on external vendors for critical operations.