Medium severity · published Aug 5, 2026
CVE-2026-70602
Electron: Extension tab APIs operate across session boundaries
6.6
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
electron · electron
< 39.8.8; >= 40.0.0-alpha.1, < 40.9.0; >= 41.0.0-alpha.1, < 41.2.1; >= 42.0.0-alpha.1, < 42.0.0-beta.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70602
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70602
Vendor Advisory
https://github.com/electron/electron/security/advisories/GHSA-m55f-7gqj-fr98
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