CVE-2026-34778

Electron: Service worker can spoof executeJavaScript IPC replies

State: Published
Severity: 5.9 Medium
Published: Apr 3, 2026
Updated: Apr 6, 2026
Reserved: Mar 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N	GitHub_M

Weaknesses

CWE-290 Authentication Bypass by Spoofing
CWE-345 Insufficient Verification of Data Authenticity

Affected Products

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

References

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

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