Polkadot reports a key leak at Fearless Wallet, 17,286 DOT are gone: how to check your extension

The information provided in this article is for informational purposes only and does not constitute financial advice. Cryptocurrency investments carry a high degree of risk. Always conduct your own research.Context: on October 21 the Polkadot Community Foundation reported four versions of the Fearless Wallet extension as compromised. Anyone who has used it since February 2025 needs new keys, not a new password.Here is what is documented: four versions of the Fearless Wallet browser extension sent a copy of the private key to a server belonging to an attacker whenever the wallet was unlocked. Eight users have reported unauthorised transfers so far, totalling 17,286 DOT. Our assessment follows further below: the number of reported cases is the smaller part of the problem. The notice is dated October 21, 2026. The product affected is a third-party one, not the network's official software: Fearless Wallet was never an official Polkadot wallet. In concrete terms it still means this: if that extension sat on your machine at any point since February 2025, every account created with it counts as exposed, whether or not anything has drained from it so far. The security notice describes neit...