CVE-2026-70604
Impact
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. Apps that set corsEnabled: true, or that do not load untrusted content, are not affected.
Workarounds
Set corsEnabled: true on schemes that must enforce CORS, and validate the request Origin in your protocol handler before returning sensitive data.
Fixed Versions
- 42.0.0
- 41.4.0
- 40.9.3
- 39.8.10
For more information
If you have any questions or comments about this advisory, email Electron at security@electronjs.org
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Advisory coverage (2)
External references
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