Polymarket Halts Trading After $2.5M Stolen Through Injected Malicious Script

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Polymarket, a decentralized prediction market, has suspended trading after attackers stole roughly $2.5 million from users. The breach, which happened on October 29, 2026, did not exploit the platform's smart contracts but instead came through a compromised third-party service that delivered front-end code. Attackers used that access to push a crypto-draining script that tricked users into signing malicious transactions or unlimited token approvals. About $2.5 million has been traced to a wallet believed to belong to the attacker, while the compromised service, the total number of victims, and any restitution plans remain unconfirmed. The incident underscores the risks of third-party scripts and the importance of protections such as Subresource Integrity and strict Content Security Policies.

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