What’s Vulnerable › Vulnerabilities
CVE-2026-70602: Electron: Extension tab APIs operate across session boundaries
- Severity: medium (CVSS 6.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-05 · updated 2026-10-08
- Weakness: CWE-284
Description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, 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. This issue is fixed in versions 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.
Affected products
- electron: before 39.8.8; from 40.0.0 before 40.9.0; from 41.0.0 before 41.2.1; 42.0.0-alpha1, 42.0.0-alpha2, 42.0.0-alpha3, 42.0.0-alpha4, 42.0.0-alpha5, 42.0.0-alpha6 (+2) — fixed in 39.8.8, 40.9.0, 41.2.1
How to fix
Upgrade to a fixed version: electron 39.8.8, 40.9.0, 41.2.1. Check the vendor advisory for mitigations.
References
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