CVE-2026-70599: Electronjs Electron

Medium severity, CVSS 5.9. EPSS: 0.2% 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 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, serial-port and media permission checks made from an iframe passed the top-level frame origin to session.setPermissionCheckHandler instead of the requesting iframe origin. Origin-based handler logic could grant a cross-origin iframe device access intended only for the top-level origin. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.

Affected products

• Electronjs Electron: before 39.8.7 (fixed in 39.8.7); from 40.0.0, before 40.9.0 (fixed in 40.9.0); from 41.0.0, before 41.2.1 (fixed in 41.2.1); version 42.0.0 only

Published 2026-08-05. Last modified 2026-10-08.