CVE-2020-4077 json
Context isolation bypass via contextBridge in Electron
published 2020-07-07 6 y ago modified 2026-07-08 4 mo ago also GHSA-h9jc-284h-533g , EUVD-2020-0558
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
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 both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.
Patch / fix
- npm electron 7.2.4, 8.2.4
- electronjs electron 7.2.4, 8.2.4
Exploit prediction
1.00% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N |
| NVD | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
| GitHub | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | electron | <7.2.4 >=8.0.0, <8.2.4 |
7.2.4 8.2.4 |
Affected products
- electron electron
Classification
- Weakness
-
- CWE-501 Trust Boundary Violation
References
-
github.com
/electron/electron/commit/b8e347709245d2dc5640fbb3044d9b21b4eaa6b0
web
-
electronjs.org
/releases/stable?page=3#release-notes-for-v824
web, release-notes, vendor-advisory
-
github.com
/electron/electron/security/advisories/GHSA-h9jc-284h-533g
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-4077
advisory
Sources
- CVE List CVE-2020-4077
- GitHub Advisory GHSA-h9jc-284h-533g
- NVD CVE-2020-4077
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.