CVE-2026-70602: Medium severity npm/electron vulnerability

Published Aug 5, 2026
·
Updated

Impact Extension tab and scripting APIs were not scoped to the extension's own session. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session.

Apps are only affected if they load Chrome extensions via session.loadExtension and rely on separate sessions to isolate that extension from other content. Apps that do not load extensions, or that use a single session, are not affected.

Workarounds Only load extensions from sources you trust; do not rely on session separation alone to contain an extension.

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 to a version that resolves this vulnerability.

    Fixed in 39.8.8
  6. Upgrade

    Upgrade electron to a version that resolves this vulnerability.

    Fixed in 40.9.0
  7. Upgrade

    Upgrade electron to a version that resolves this vulnerability.

    Fixed in 41.2.1
  8. Upgrade

    Upgrade electron to a version that resolves this vulnerability.

    Fixed in 42.0.0-beta.3
  9. Compensating control

    Only load Chrome extensions from sources you trust; do not rely on session separation alone to contain an extension.

Event History

Aug 5, 2026
Advisory Published
via GitHub·03:57 PM
Data Sourced
via GitHub·03:57 PM
DescriptionSeverityWeaknessAffected Software
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