Hack history / 2026 / Hack or exploit
Polymarket International
Hack or exploit on Jun 25, 2026 · Frontend Compromise
SOURCES AGREE ON DATE AND LOSS · 3 SOURCES
Lost
$3M
sources: $2.9M to $3.1M
Returned
none listed
as the sources state it
Rank
#586
among thefts by dollars lost
What happened
On June 25, 2026, Polymarket frontend was compromised via third-party vendor, injecting malicious JavaScript that phished users into approving fraudulent token transfers, draining $3M from at least 11 wallets.
Details
- Date
- Jun 25, 2026
- Kind
- Hack or exploit
- Method
- Frontend Compromise
- How in
- Keys, accounts and infrastructure
- Target
- DeFi protocol
- Chains
- Polygon
Related incidents
Polymarket International 2026 · Hack or exploit · $2.7M
Polymarket 2026 · Hack or exploit · $700K
Polymarket 2025 · Hack or exploit · $500K
Polymarket suffers governance attack as whale manipulates Ukraine bet resolution; refuses refunds 2025 · Fraud · $7M
Matcha 2026 · Hack or exploit · $13.4M
Polymarket 2026 · Hack or exploit · $700K
Polymarket 2025 · Hack or exploit · $500K
Polymarket suffers governance attack as whale manipulates Ukraine bet resolution; refuses refunds 2025 · Fraud · $7M
Matcha 2026 · Hack or exploit · $13.4M
Cite this page
SwanBluechip, "Polymarket International hack, Jun 25, 2026: $3M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht0feab10152/ (data as of 2026-11-01).