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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-70604
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 16:17:04 UTC
Updated2026-08-05 19:17:39 UTC
DescriptionElectron 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Problem Types: CWE-942 | CWE-942 CWE-942: Permissive Cross-domain Policy with Untrusted Domains

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Electron Electron affected < 39.8.10 Not specified
CNA Electron Electron affected >= 40.0.0-alpha.1, < 40.9.3 Not specified
CNA Electron Electron affected >= 41.0.0-alpha.1, < 41.4.0 Not specified
CNA Electron Electron affected >= 42.0.0-alpha.1, < 42.0.0 Not specified

References

ReferenceSourceLinkTags
github.com/electron/electron/security/advisories/GHSA-v3j7-r9gq-3gjw [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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