Exposure of Resource to Wrong Sphere Affecting electron package, versions <39.8.5>=40.0.0-alpha.2 <40.8.5>=41.0.0-alpha.1 <41.1.0>=42.0.0-alpha.1 <42.0.0-alpha.5
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Test your applications- Snyk IDSNYK-JS-ELECTRON-15923931
- published7 Apr 2026
- disclosed7 Apr 2026
- creditUnknown
Introduced: 7 Apr 2026
NewCVE-2026-34765 (opens in a new tab)How to fix?
Upgrade electron to version 39.8.5, 40.8.5, 41.1.0, 42.0.0-alpha.5 or higher.
Overview
electron is a framework which lets you write cross-platform desktop applications using JavaScript, HTML and CSS.
Affected versions of this package are vulnerable to Exposure of Resource to Wrong Sphere via the window.open() function. An attacker can gain access to or manipulate the browsing context of a window opened by a different renderer by using the same target name, potentially inheriting elevated permissions such as privileged preload scripts or relaxed security settings. This is only exploitable if multiple top-level windows with differing trust levels are opened and setWindowOpenHandler is used to grant elevated webPreferences to child windows.
Workaround
This vulnerability can be mitigated by denying window.open() in renderers that load untrusted content by returning { action: 'deny' } from setWindowOpenHandler and avoiding granting child windows more permissive webPreferences than their opener.