Vulnerability details

CVE-2026-70604

electron electron

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

CVSS 3.1

7.4High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.4High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
electron	electron	< 39.8.10	CVEProject cvelistV5 (CNA)
electron	electron	>= 40.0.0-alpha.1, < 40.9.3	CVEProject cvelistV5 (CNA)
electron	electron	>= 41.0.0-alpha.1, < 41.4.0	CVEProject cvelistV5 (CNA)
electron	electron	>= 42.0.0-alpha.1, < 42.0.0	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-08-05
Last updated: 2026-08-05
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.35%

Probability of exploitation in 30 days

29.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-942
Permissive Cross-domain Policy with Untrusted Domains