CVE-2026-70612: Medium severity npm/electron vulnerability

Published Aug 5, 2026
·
Updated

Impact Requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could cause an OS-registered external application to be launched. The frame's sandbox state was also not made available to the app's permission handlers.

Apps are only affected if they render untrusted content in sandboxed iframes and grant the openExternal permission (granted by default when no setPermissionRequestHandler is installed). Apps whose permission handler denies openExternal for untrusted content are not affected.

Workarounds Install a setPermissionRequestHandler that denies the openExternal permission for untrusted content.

Fixed Versions 42.0.0-beta.3 41.2.1 40.9.0 39.8.8

For more information If you have any questions or comments about this advisory, email Electron at security@electronjs.org

Affected Software

4 affected componentsFixes available
npm/electron>=42.0.0-alpha.1<42.0.0-beta.3
42.0.0-beta.3
npm/electron>=41.0.0-alpha.1<41.2.1
41.2.1
npm/electron>=40.0.0-alpha.1<40.9.0
40.9.0
npm/electron<39.8.8
39.8.8

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade npm/electron to a version that resolves this vulnerability.

    Fixed in 42.0.0-beta.3
  2. Upgrade

    Upgrade npm/electron to a version that resolves this vulnerability.

    Fixed in 41.2.1
  3. Upgrade

    Upgrade npm/electron to a version that resolves this vulnerability.

    Fixed in 40.9.0
  4. Upgrade

    Upgrade npm/electron to a version that resolves this vulnerability.

    Fixed in 39.8.8
  5. Upgrade

    Upgrade electron/electron to a version that resolves this vulnerability.

    Fixed in 39.8.8
  6. Upgrade

    Upgrade electron/electron to a version that resolves this vulnerability.

    Fixed in 40.9.0
  7. Upgrade

    Upgrade electron/electron to a version that resolves this vulnerability.

    Fixed in 41.2.1
  8. Upgrade

    Upgrade electron/electron to a version that resolves this vulnerability.

    Fixed in 42.0.0-beta.3
  9. Configuration

    Install a setPermissionRequestHandler that denies the openExternal permission for untrusted content in sandboxed iframes.

    Electron (setPermissionRequestHandler for webContents permission requests) openExternal permission handling for untrusted content in sandboxed iframes = deny

Event History

Aug 5, 2026
Advisory Published
via GitHub·05:56 PM
Data Sourced
via GitHub·05:56 PM
DescriptionSeverityWeaknessAffected Software
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