# Electrum Fixes Bitcoin (BTC) Wallet Flaw Exploited by Malicious Servers By Simon Yoon Canonical URL: https://www.tokenpost.com/news/technology/40302 Published: 2026-10-24T20:15:55.000Z Updated: 2026-10-24T20:15:55.000Z Section: Technology > The fake transaction carried no fee until a user manually raised it and signed, sending a payment to the attacker. Electrum's Bitcoin (BTC) wallet flaw let malicious servers replace a transaction's wallet-history entry after its broadcast, and developers said two users reported attacks, with one reporting a loss. A user first broadcast a legitimate transaction. A malicious server could suppress it and replace its history entry with a conflicting, invalid transaction directed to the attacker. The fake transaction carried a zero fee. A user manually raised the fee and signed it, causing the payment to go to the attacker. Electrum's developers said malicious servers had exploited the flaw in the wild. Version 4.8.3 is listed as patched. The technical disclosure adds details to [Electrum's earlier release announcement](), which urged users to install the update. ## Links in this article - [Electrum's earlier release announcement](https://www.tokenpost.com/news/technology/40197)