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Polymarket Suffers Site Breach, Approximately 480 Million Yen in Cryptocurrency Stolen, Full Refund Promised

2026/06/26 10:19 (Updated 2026/06/26 12:01)
CoinPost
Written by Enzo
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Polymarket Suffers Site Breach, Approximately 480 Million Yen in Cryptocurrency Stolen, Full Refund Promised

Frontend Breach via External Vendor

Frontend Breach via External Vendor

On the 26th, prediction market platform Polymarket announced that it had been the victim of a hack through a third-party vendor, which led to malicious code being embedded in the frontend of its website.

As a result of this breach, cryptocurrency worth approximately $3 million (about 480 million yen, based on an exchange rate of 160 yen to the dollar) was stolen from fewer than 15 user accounts.

Cryptocurrency media outlet Decrypt reported that...

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MAGAZINE

Iolite Vol.20

July 2026 issueReleased on 2026/05/29
Interview Michael Shaulov, CEO & Co-Founder of Fireblocks Marcus Infanger, SVP of RippleX PHOTO & INTERVIEW Ryoko Yonekura Special Features "The Future of Payments: Beyond the Gateway" "Innovation Without Taboos: The Dual-Use Shockwave" "The Future of Humanity Expanded by BMI: The 'Sixth Sense' Stemming from Brain-Computer Interface Devices" [Dialogue Series] The NISHI Talk: Crypto Conversations"The 'True Decentralization' of DeFi and the Challenges Facing the Crypto Industry" Kasou NISHI × Yoshihiko Uchida Series Tech and Future by Toshinao Sasaki... and more.