TREE NEWS update: Electrum released version 4.8.3 on October 24, 2026, patching a security flaw exploited in real attacks. Malicious servers could show users forged transactions and, when users tried to speed up a payment via replace-by-fee (RBF), trick them into signing a transaction paying an attacker’s address — without obtaining private keys. Electrum said it received two related reports; one user lost bitcoin after raising the fee, and users are advised to update to 4.8.3.
Electrum 4.8.3 Patch Fixes Flaw That Let Malicious Servers Trick Users Into Signing Bitcoin Theft Transactions
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AI take
The notable point is that this attack required no key compromise: the wallet's own interface, via RBF fee-bumping, became the delivery mechanism for a forged transaction. That puts the risk squarely on self-custody users of Electrum who rely on third-party servers, a group already exposed to server-side misbehavior. The two reports suggest exploitation was limited but real, and the open question is whether other wallets with similar server-dependence and fee-bump flows share the same weakness.
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