Blockaid flags CoW Swap site as malicious amid front end attack

CoW Swap said it was investigating a front end issue after Blockaid flagged cow.fi as malicious and warned users to revoke approvals.

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Add us on Google by Estefano Gomez Apr. 14, 2026

Blockaid has flagged a front end attack affecting CoW Swap, warning users that cow.fi had been marked as malicious and urging anyone who connected a wallet to revoke token approvals and avoid interacting with the app.

🚨 Community Alert:

Blockaid's system has identified a front-end attack on @CoWSwap.

The site cow[.]fi has been flagged as malicious.

If your wallet is connected, revoke approvals and avoid any interactions with the dApp immediately. pic.twitter.com/xGGmY53RMR

— Blockaid (@blockaid_) April 14, 2026

The alert added fresh concern around one of DeFi’s better known trading interfaces, which routes swaps across multiple liquidity sources.

🚨🚨

We are currently experiencing an issue with the CoW Swap frontend (https://t.co/GPQ8bBzftU). While we are investigating, please DO NOT use CoW Swap.

— CoW DAO (@CoWSwap) April 14, 2026

CoW Swap also acknowledged the issue, saying it was experiencing a problem with its front end and urging users not to use the platform for the moment.

CoW Swap is the main trading interface built on CoW Protocol, a decentralized trading system that uses batch auctions and a network of competing solvers to find execution across onchain liquidity venues.

The protocol markets itself around MEV protection and currently supports activity across major networks including Ethereum, Base, Polygon, Arbitrum, Gnosis, Avalanche, BNB, Linea, Plasma, and Ink.

This is a developing story and will be updated as more details emerge.

Disclosure: This article was edited by Estefano Gomez. For more information on how we create and review content, see our Editorial Policy.