Vulnerability · Published Aug 5, 2026 · Assigned by GitHub_M

CVE-2026-70602Electron: Extension tab APIs operate across session boundaries

Medium 6.6

In plain English

A medium-severity improper access control in electron from electron. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.6Medium

Exploit odds (30 days)0.3%top 82.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	electron	39.8.8	GHSA-m55f-7gqj-fr98
npm	electron	40.9.0	GHSA-m55f-7gqj-fr98
npm	electron	41.2.1	GHSA-m55f-7gqj-fr98
npm	electron	42.0.0-beta.3	GHSA-m55f-7gqj-fr98

Affected products (as reported)

Vendor	Product	Versions
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

Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N

References

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