CVE-2026-70604

Electron: Custom protocol with supportFetchAPI but not corsEnabled allows cross-origin reads

HIGH

7.4

CVSS Score

Published: August 5, 2026 at 03:59 PM UTC

Updated: October 8, 2026 at 01:53 PM UTC

2 products affected across 2 vendorsElectronElectron

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Severity

HIGH7.4

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was not subject to CORS enforcement. A page loaded from a remote origin could therefore fetch() or XMLHttpRequest that scheme cross-origin and read the full response body, rather than the read being blocked. Apps that serve sensitive data from such a scheme and load remote or untrusted content in a renderer are affected. This issue is fixed in versions 39.8.10, 40.9.3, 41.4.0, and 42.0.0.

Affected

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

Electron · Electronjsnpm

95%

v < 39.8.1040.0.0 ≤ v < 40.9.341.0.0 ≤ v < 41.4.0*42.0.0 42.0.0 alpha1 42.0.0 alpha2 42.0.0 alpha3 42.0.0 alpha4 42.0.0 alpha5 42.0.0 alpha6 42.0.0 beta1 42.0.0 beta2 42.0.0 beta3 42.0.0 beta4 42.0.0 beta5 42.0.0 beta6 42.0.0 beta7 42.0.0 beta8

Affected range stops below 39.8.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 40.9.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 41.4.0, so it looks safe — our inference, not a vendor statement

Electron · Electron

90%

v < 39.8.10>= 40.0.0-alpha.1, < 40.9.3>= 41.0.0-alpha.1, < 41.4.0>= 42.0.0-alpha.1, < 42.0.0

Affected range stops below 39.8.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 40.9.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 41.4.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 42.0.0, 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

https://github.com/electron/electron/security/advisories/GHSA-v3j7-r9gq-3gjw

References (1)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/electron/electron/security/advisories/GHSA-v3j7-r9gq-3gjw

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-942

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