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Vulnerability · Published Sep 29, 2026 · Assigned by GitHub_M

CVE-2026-102673Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

High 8.2

In plain English

A high-severity security flaw in electron from electron. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.1%top 97.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmelectron41.10.4GHSA-hq2x-r82h-9wj4
npmelectron42.5.2GHSA-hq2x-r82h-9wj4
npmelectron43.0.0GHSA-hq2x-r82h-9wj4

Affected products (as reported)

VendorProductVersions
electron electron < 41.10.4>= 42.0.0-alpha.1, < 42.5.2>= 43.0.0-alpha.1, < 43.0.0

Weakness: CWE-346, CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References