Tech
Polymarket hit by frontend attack after third-party JavaScript vendor breach
Polymarket disclosed a frontend breach after hackers compromised an unnamed third-party JavaScript vendor and injected malicious code into the platform's website. The supply chain attack, reported June 26, 2026, manipulated blockchain transactions for some users by targeting frontend infrastructure rather than Polymarket's core smart contracts or exchange backend.
Why this matters?
Polymarket faces a confirmed frontend breach via third-party JavaScript vendor. The supply-chain failure hands Kalshi and emerging rivals like Meta's Arena a concrete trust argument to lure traders away while CFTC and Senate scrutiny intensifies.
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