Polymarket customers lose $3 million in supply-chain attack

BleepingComputer

June 26, 2026 at 6:04 PM

Actively Exploited

Overview

Polymarket, an online prediction market platform, reported a significant security incident that resulted in approximately $3 million in losses for its customers. This breach occurred when attackers injected a malicious script into Polymarket's frontend, exploiting a vulnerability in a third-party vendor's systems. As a result, user accounts were compromised, leading to unauthorized access and theft of funds. Polymarket has stated that it will fully reimburse affected customers, which is a crucial step in maintaining trust with its user base. This incident emphasizes the risks associated with relying on third-party services and highlights the importance of robust security measures in online platforms.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Polymarket platform, third-party vendor systems
Action Required: Polymarket will reimburse affected customers; specific security measures not detailed.
Timeline: Newly disclosed

Original Article Summary

Polymarket says it will fully reimburse customers who lost an estimated $3 million after hackers injected a malicious script into the platform's frontend following a breach at a third-party vendor. [...]

Impact

Polymarket platform, third-party vendor systems

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Polymarket will reimburse affected customers; specific security measures not detailed.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Vulnerability.

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