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Vulnerabilities CVE-2026-70612

CVE-2026-70612

Medium
Open
TLP:CLEAR

Electron: Sandboxed iframes can launch external protocol handlers

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Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could cause an OS-registered external application to be launched. The frame sandbox state was also not made available to the app permission handlers, affecting apps that render untrusted content in sandboxed iframes and grant the openExternal permission by default when no setPermissionRequestHandler is installed. This issue is fixed in 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

Details

CVSS Score
5.4
EPSS Score
0.36%

29.2th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Confidence
90%
Published
Aug 5, 2026
Last Modified
Aug 5, 2026
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