CVE-2026-70604
CVE-2026-70604 · Electron: Custom protocol with supportFetchAPI but not corsEnabled allows cross-origin reads
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 7.4 · High · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
electron
- Versions
- < 39.8.10: Affected
- >= 40.0.0-alpha.1, < 40.9.3: Affected
- >= 41.0.0-alpha.1, < 41.4.0: Affected
- >= 42.0.0-alpha.1, < 42.0.0: Affected
No fix published
electron npm
- Affected ranges
- SEMVER: ≥ 42.0.0-alpha.1, < 42.0.0
Update to 42.0.0
electron npm
- Affected ranges
- SEMVER: ≥ 41.0.0-alpha.1, < 41.4.0
Update to 41.4.0
electron npm
- Affected ranges
- SEMVER: ≥ 40.0.0-alpha.1, < 40.9.3
Update to 40.9.3
electron npm
- Affected ranges
- SEMVER: < 39.8.10
Update to 39.8.10