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Poly Network Cross-Chain Exploit

ExploitCriticalResolved$611M
Description

Attacker exploited cross-chain relay contract to forge messages, gaining control of funds across Ethereum, BSC, and Polygon. $611M stolen but later returned.

Evidence & References

Affected Protocol

Poly Network

Vulnerability Type

cross chain message forgery

Date Occurred

2021-08-10

Date Reported

2026-04-21