github.com
https://github.com/electron/electron CVE-2026-70602
MEDIUM
Electron: Extension tab APIs operate across session boundaries
Record summary
CVE-2026-70602 has a selected CVSS score of 6.6 (medium).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 5, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
electronBrowse electron / electron | CVE List | < 39.8.8 | affected |
| >= 40.0.0-alpha.1, < 40.9.0 | affected | ||
| >= 41.0.0-alpha.1, < 41.2.1 | affected | ||
| >= 42.0.0-alpha.1, < 42.0.0-beta.3 | affected | ||
electronBrowse npm / electron | GitHub Advisory | Before 39.8.8 · Fixed in 39.8.8 | affected |
| 40.0.0-alpha.1 to < 40.9.0 · Fixed in 40.9.0 | affected | ||
| 41.0.0-alpha.1 to < 41.2.1 · Fixed in 41.2.1 | affected | ||
| 42.0.0-alpha.1 to < 42.0.0-beta.3 · Fixed in 42.0.0-beta.3 | affected |
References
2github.comConfirmation
https://github.com/electron/electron/security/advisories/GHSA-m55f-7gqj-fr98