Electron up to 39.8.8/40.9.1/41.2.1/42.0.0-beta.4 contextBridge isolation

Summaryinfo

A vulnerability was found in Electron up to 39.8.8/40.9.1/41.2.1/42.0.0-beta.4. It has been rated as critical. Impacted is an unknown function of the component contextBridge. This manipulation causes isolation. This vulnerability is handled as CVE-2026-70601. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in Electron up to 39.8.8/40.9.1/41.2.1/42.0.0-beta.4. Affected by this vulnerability is an unknown function of the component contextBridge. The manipulation with an unknown input leads to a isolation vulnerability. The CWE definition for the vulnerability is CWE-653. The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.5, apps that expose Promise-returning functions to web content via contextBridge may be vulnerable to a context isolation bypass. Untrusted web content could obtain access to the isolated preload world and, through it, every capability the preload script has. In renderers without a sandbox, or with nodeIntegration enabled, this may escalate to Node.js access. Apps are affected if they expose Promise-returning functions via contextBridge, the standard pattern for wrapping ipcRenderer.invoke, in windows that load untrusted content. This issue is fixed in versions 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.5.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-70601 since 08/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 39.8.9, 40.9.2, 41.2.2 or 42.0.0-beta.5 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Electron

Version

• 39.8.0
• 39.8.1
• 39.8.2
• 39.8.3
• 39.8.4
• 39.8.5
• 39.8.6
• 39.8.7
• 39.8.8
• 40.9.0
• 40.9.1
• 41.2.0
• 41.2.1
• 42.0.0-beta.0
• 42.0.0-beta.1
• 42.0.0-beta.2
• 42.0.0-beta.3
• 42.0.0-beta.4

Website

• Product: https://github.com/electron/electron/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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