Electrum Wallet Attack Hid Bitcoin Theft Behind a Fee Increase

Electrum released version 4.8.3 after attackers exploited a flaw in malicious wallet servers to steal bitcoin. The servers could swap a legitimate payment for a thief's transaction and then wait for the owner to approve the theft, disguising it behind a fee increase. The patch closes the loophole, but the incident highlights custody and infrastructure risk for self-custody bitcoin users.