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Bitcoin wallet flaw let hackers steal funds by faking transactions during fee increases

Market News
26 Oct 2026
Coindesk
View Source
Bearish
Bitcoin wallet flaw let hackers steal funds by faking transactions during fee increases

A security flaw in the Electrum Bitcoin wallet allowed attackers controlling rogue servers to replace legitimate unconfirmed transactions with fake ones. When users tried to speed up payments by increasing fees using the Replace-by-Fee feature, they unknowingly authorized transactions sending funds to attackers. At least one user lost bitcoin before Electrum patched the vulnerability in version 4.8.3 on October 24, which added signature verification for unconfirmed transactions. Users are advised to upgrade immediately and verify payment details carefully; those using trusted servers were not affected.

The Bitcoin wallet bug story is presented alongside a snapshot of the cryptocurrency market on Pluang as of Oct 26, 2026 11:41 WIB. Among 50 major cryptocurrencies priced on Pluang, 6 rose and 42 fell today. Notable movers include THETA at Rp3.271 with a 1-day change of -3.77% and a Pluang order activity of 13% Sell / 87% Buy, FIL at Rp16.468 down 3.41% with 67% Sell / 33% Buy, and COTI at Rp187 down 3.25% with 53% Sell / 47% Buy.

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