Vulnerability in Electron

CVE-2026-102673

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 41.10.4, 42.5.2, and 43.0.0, popups opened from a sandboxed iframe through Electron's OpenURLFromTab navigation path, including links using target="_blank" or a middle-click, did not receive the inherited HTML sandbox restrictions. An untrusted iframe using the allow-scripts allow-popups configuration could therefore open a popup with the embedding application's full origin, exposing that origin's cookies, storage, and same-origin scripting capabilities. Applications that do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in versions 41.10.4, 42.5.2, and 43.0.0.

Published .

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

  • Electron — versions < 41.10.4, >= 42.0.0-alpha.1, < 42.5.2, >= 43.0.0-alpha.1, < 43.0.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-102673?
CVE-2026-102673 is a high-severity vulnerability in Electron, classified under Origin Validation Error. CVSS score: 8.2/10. Published 2026-09-29.
How severe is CVE-2026-102673?
High severity. CVSS v3 base score is 8.2 out of 10.