Attackers replaced legitimate transactions with fake ones, then waited for users to approve higher fees. At least one person lost bitcoin before developers patched the flaw. A flaw in Electrum allowed malicious servers to substitute fake pending Bitcoin transactions that users could unknowingly authorize when using Replace-by-Fee, with at least one theft confirmed. Electrum released version 4.8.3 on Oct. 24 to verify signatures on relevant unconfirmed transactions, but earlier versions remain v…
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