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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

Electrum: Malicious server can replace a just-broadcast tx and try to trick user into RBF-ing it

Fix availableCritical · CVSS 9.3

Published Oct 28, 2026 · updated Oct 28, 2026

What to do

  1. Upgrade to a fixed version: electrum 4.8.3.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIelectrum

Vulnerable versions
< 4.8.3
Fixed in
4.8.3

Check your project: pip show electrum

What changed

  1. Oct 28, 2026

    Published in the GitHub Advisory Database as critical.

Sources

CWE-347 Improper Verification of Cryptographic Signature

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