Electrum 4.8.3 Fixes Vulnerability Inducing Signing of Fraudulent Transactions

Electrum released version 4.8.3 on October 24, 2026, addressing a security vulnerability that has been exploited in real attacks. Malicious servers can present users with forged transactions and induce them to sign transactions that pay the attacker’s address when users attempt to accelerate transactions using Replace-By-Fee (RBF), without the attacker needing to obtain the user's private key. Electrum reported receiving two related reports, one of which involved a user losing Bitcoin after increasing the transaction fee, and recommends users update to version 4.8.3.

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