CVE-2026-70602

Electron: Extension tab APIs operate across session boundaries

Published Aug 5, 2026 CVSS 3.1 · 6.6 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-m55f-7gqj-fr98 Electron: Extension tab APIs operate across session boundaries
History
Type Values Removed Values Added
First Time appeared Electronjs
Electronjs electron
CPEs cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha4:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha5:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha6:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:beta1:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:beta2:*:*:*:node.js:*:*
Vendors & Products Electronjs
Electronjs electron
Type Values Removed Values Added
First Time appeared Electron
Electron electron
Vendors & Products Electron
Electron electron
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Electron: Extension tab APIs operate across session boundaries
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 5, 2026, 4:13 PM
Reserved
Aug 4, 2026, 7:50 PM
Status
Analyzed
Published
Aug 5, 2026, 4:17 PM
Modified
Oct 8, 2026, 1:54 PM