CVE-2026-70604: Electronjs Electron

High severity, CVSS 7.4. EPSS: 0.4% 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 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was not subject to CORS enforcement. A page loaded from a remote origin could therefore fetch() or XMLHttpRequest that scheme cross-origin and read the full response body, rather than the read being blocked. Apps that serve sensitive data from such a scheme and load remote or untrusted content in a renderer are affected. This issue is fixed in versions 39.8.10, 40.9.3, 41.4.0, and 42.0.0.

Affected products

• Electronjs Electron: before 39.8.10 (fixed in 39.8.10); from 40.0.0, before 40.9.3 (fixed in 40.9.3); from 41.0.0, before 41.4.0 (fixed in 41.4.0); version 42.0.0 only

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