Vulnerability in Electron
CVE-2026-70604
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.
EPSS: 0.003 (20.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.
Affected products
- Electron — versions < 39.8.10, >= 40.0.0-alpha.1, < 40.9.3, >= 41.0.0-alpha.1, < 41.4.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-70604?
- CVE-2026-70604 is a high-severity vulnerability in Electron, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 7.4/10. Published 2026-08-05.
- How severe is CVE-2026-70604?
- High severity. CVSS v3 base score is 7.4 out of 10.