Vulnerability · Published Apr 3, 2026 · Assigned by GitHub_M

CVE-2026-34778Electron: Service worker can spoof executeJavaScript IPC replies

Medium 5.9

In plain English

A medium-severity authentication bypass by spoofing 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 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.1%top 97.4% 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 versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	electron	38.8.6	GHSA-xj5x-m3f3-5x3h
npm	electron	39.8.1	GHSA-xj5x-m3f3-5x3h
npm	electron	40.8.1	GHSA-xj5x-m3f3-5x3h
npm	electron	41.0.0	GHSA-xj5x-m3f3-5x3h

Affected products (as reported)

Vendor	Product	Versions
electron	electron	< 38.8.6>= 39.0.0-alpha.1, < 39.8.1>= 40.0.0-alpha.1, < 40.8.1>= 41.0.0-alpha.1, < 41.0.0

Weakness: CWE-290, CWE-345 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

References

https://github.com/electron/electron/security/advisories/GHSA-xj5x-m3f3-5x3h x_refsource_CONFIRM