CVE-2026-34773: Electronjs Electron

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol name before writing to the registry. Apps that pass untrusted input as the protocol name may allow an attacker to write to arbitrary subkeys under HKCU\Software\Classes\, potentially hijacking existing protocol handlers. Apps are only affected if they call app.setAsDefaultProtocolClient() with a protocol name derived from external or untrusted input. Apps that use a hardcoded protocol name are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

Affected products

• Electronjs Electron: before 38.8.6 (fixed in 38.8.6); from 39.0.0, before 39.8.1 (fixed in 39.8.1); from 40.0.0, before 40.8.1 (fixed in 40.8.1); version 41.0.0 only

Published 2026-04-04. Last modified 2026-07-24.