CVE-2026-70604 electron CVE debrief

Who should care

Developers and administrators of Electron applications using custom schemes, especially those serving sensitive data and loading remote or untrusted content, should be aware of this vulnerability and take necessary actions to mitigate it. This includes updating Electron to a secure version, assessing applications using custom schemes, and implementing CORS enforcement for custom schemes. Security teams and vulnerability management teams should also be aware of this vulnerability and review their applications for potential exposure.

Technical summary

Electron versions prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0 have a vulnerability in custom schemes registered with supportFetchAPI: true but without corsEnabled: true. This allows cross-origin data exposure when a page loads from a remote origin and fetches or XMLHttpRequest the scheme. The vulnerability can be mitigated by updating Electron to a secure version, assessing applications using custom schemes, and implementing CORS enforcement for custom schemes.

Defensive priority

Electron applications using custom schemes with supportFetchAPI: true but without corsEnabled: true may be vulnerable to cross-origin data exposure.

Recommended defensive actions

• Review and update Electron to version 39.8.10, 40.9.3, 41.4.0, or 42.0.0 or later
• Assess applications using custom schemes with supportFetchAPI: true but without corsEnabled: true
• Implement CORS enforcement for custom schemes
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record indicates that Electron versions prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0 are affected by a custom scheme vulnerability. Apps serving sensitive data from such schemes and loading remote or untrusted content may be impacted. The vulnerability allows cross-origin data exposure when a page loads from a remote origin and fetches or XMLHttpRequest the scheme. Evidence is limited to CVE and NVD details.

Official resources