CVE-2026-34778CWE-290CWE-345

Electron: Service worker can spoof executeJavaScript IPC replies

Medium · published April 3, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
3.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00139 · 3.0th percentile
Weaknesses
CWE-290 · Authentication Bypass by Spoofing; CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-04-03T23:59Z
EPSS history
Timeline
  • 03 APR 23:59Z
    Electron: Service worker can spoof executeJavaScript IPC replies
    cvelistv5