Electrum 4.8.3 fixes a live attack: a malicious server swaps your pending payment, waits for you to bump the fee, and you sign the thief's tx. One user lost money. The trick and what to check: https://theonchaindiary.com/articles/electrum-server-swapped-transaction-fee-bump/
theonchaindiary.comElectrum 4.8.3: Malicious Server Stole BTC on Fee BumpA malicious Electrum server replaced a pending payment with one paying itself. Version 4.8.3 now verifies signatures. Upgrade and verify addresses.
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