Context isolation bypass via leaked cross-context objects in Electron

published 2020-07-07 6 y ago modified 2026-07-08 4 mo ago also GHSA-m93v-9qjc-3g79 , EUVD-2020-0565

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

npm electron 7.2.4, 8.2.4
electronjs electron 7.2.4, 8.2.4

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
NVD	3.1	9.0	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
NVD	2.0	3.6	AV:L/AC:L/Au:N/C:P/I:P/A:N
GitHub	3.1	7.8	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/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

electronjs.org /releases/stable?page=3#release-notes-for-v824
web, release-notes, vendor-advisory
github.com /electron/electron/security/advisories/GHSA-m93v-9qjc-3g79
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-4076
advisory

Sources

CVE List CVE-2020-4076
GitHub Advisory GHSA-m93v-9qjc-3g79
NVD CVE-2020-4076

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.

Summary