Electrum released version 4.8.3 on Oct. 24, 2026, to patch a security flaw that had already been exploited in real attacks, according to monitoring cited by Bitcoin News. The issue allowed a malicious server to show a fake transaction to a user and, when the user tried to speed it up with Replace-By-Fee, trick them into signing a payment to an attacker-controlled address. Electrum said the attacker did not need access to the user’s private key for the attack to work. The wallet team said it had received two reports tied to the bug. In one case, a user lost bitcoin after raising the transaction fee. Electrum urged users to update to version 4.8.3.
Electrum released version 4.8.3 on Oct. 24, 2026, fixing a security flaw that had already been used in real-world attacks, according to monitoring cited by Bitcoin News.
The bug let a malicious server present a fake transaction to a user. If the user then tried to accelerate the transaction through Replace-By-Fee, or RBF, the server could trick the user into signing a transaction that sent funds to an attacker-controlled address. The attacker did not need the user’s private key.
Electrum said it had received two related reports. In one case, a user lost bitcoin after increasing the fee. The wallet provider advised users to update to version 4.8.3.
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