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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (29.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Electron — versions < 39.8.10, >= 40.0.0-alpha.1, < 40.9.3, >= 41.0.0-alpha.1, < 41.4.0
- Electronjs Electron — versions 42.0.0
Weakness classification (CWE)
References
- github.com/electron/electron/security/advisories/GHSA-v3j7-r9gq-3gjw (Vendor Advisory)
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.