CVE-2026-102674: Electron: Windows opened from a sandboxed top-level document do not inherit its sandbox restrictions

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-29 · updated 2026-10-15
Weakness: CWE-266

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 41.10.6, 42.9.2, 43.4.1, and 44.0.0-beta.5, windows opened from a sandboxed top-level document did not inherit that document's active HTML sandbox restrictions. Untrusted content in a sandboxed top-level document that was permitted to open popups could therefore create a window with the Electron application's full origin instead of the restricted origin intended by the sandbox. Applications that deny such popups with setWindowOpenHandler are not affected. This issue is fixed in versions 41.10.6, 42.9.2, 43.4.1, and 44.0.0-beta.5.

Affected products

electron: before 41.10.6; from 42.0.0 before 42.9.2; from 43.0.0 before 43.4.1; 44.0.0-alpha1, 44.0.0-alpha2, 44.0.0-alpha3, 44.0.0-alpha4, 44.0.0-alpha5, 44.0.0-alpha6 (+7) — fixed in 41.10.6, 42.9.2, 43.4.1

How to fix

Upgrade to a fixed version: electron 41.10.6, 42.9.2, 43.4.1. Check the vendor advisory for mitigations.

References

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