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CVE-2026-70602

Electron: Extension tab APIs operate across session boundaries

Published: Aug 5, 2026Updated: Aug 5, 2026 Sources: CVE List NVDCWE-284
6.6MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 89.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:HUI:NS:CC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-284

Affected Products

electron
package-ecosystemaka electron-builder, packager
electronLibrary
OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/electron/electron/security/advisories/GHSA-m55f-7gqj-fr98
github.com

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