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CVE-2020-4077

Context isolation bypass via contextBridge in Electron

CRITICAL
9.9
CVSS Score
Published: July 7, 2020 at 12:05 AM UTC
Updated: June 17, 2026 at 03:19 AM UTC
2 products affected across 2 vendorsElectronElectron

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Severity
CRITICAL9.9
Exploit prediction
EPSS 1%

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 both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Electron· Electronjsnpm
95%
7.0.0 ≤ v < 7.2.48.0.0 ≤ v < 8.2.49.0.09.0.0 beta19.0.0 beta109.0.0 beta119.0.0 beta129.0.0 beta139.0.0 beta149.0.0 beta159.0.0 beta169.0.0 beta179.0.0 beta189.0.0 beta199.0.0 beta29.0.0 beta209.0.0 beta39.0.0 beta49.0.0 beta59.0.0 beta69.0.0 beta79.0.0 beta89.0.0 beta9
Affected range stops below 7.2.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.2.4, so it looks safe — our inference, not a vendor statement
Electron· Electron
60%
v ≤ 9.0.0-beta.20v < 7.2.4v < 8.2.4
Affected range stops below 7.2.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/electron/electron/security/advisories/GHSA-h9jc-284h-533g
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.electronjs.org/releases/stable?page=3#release-notes-for-v824

CVSS

9.9CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-501NVD-CWE-Other

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