Electrum released version 4.8.3 on Oct. 24, 2026, fixing a security vulnerability that had already been used in real-world attacks, according to monitoring by Bitcoin News. The issue allowed malicious servers to present users with fake transactions and, when a user tried to speed up a payment through Replace-By-Fee, or RBF, trick them into signing a transaction that sent funds to an attacker-controlled address. Electrum said the attack did not require access to a user’s private key. The wallet team also said it had received two reports tied to the flaw. In one case, a user lost bitcoin after increasing the transaction fee. Electrum advised users to update their software to version 4.8.3.
Electrum released version 4.8.3 on Oct. 24, 2026, fixing a security vulnerability that had already been used in real attacks, according to monitoring by Bitcoin News.
The flaw involved fake transactions during RBF attempts
Electrum said malicious servers could show users forged transactions and, when a user attempted to accelerate a transaction through Replace-By-Fee (RBF), trick that user into signing a payment to an attacker-controlled address. The attacker did not need the user’s private key.
Electrum said it received two reports
The wallet provider said it had received two reports related to the issue. In one case, a user lost bitcoin after raising the transaction fee. Electrum advised users to update to version 4.8.3.
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