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Medium · 5.9 CVE-2026-34778 EUVD-2026-18955GHSA-xj5x-m3f3-5x3h

Electron: Service worker can spoof executeJavaScript IPC replies

Published Apr 3, 2026 · Updated Apr 6, 2026 · Assigned by GitHub_M

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 products

VendorProductAffectedFixed
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 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm electron < 38.8.6 38.8.6 GHSA-xj5x-m3f3-5x3h
npm electron >= 39.0.0-alpha.1, < 39.8.1 39.8.1 GHSA-xj5x-m3f3-5x3h
npm electron >= 40.0.0-alpha.1, < 40.8.1 40.8.1 GHSA-xj5x-m3f3-5x3h
npm electron >= 41.0.0-alpha.1, < 41.0.0 41.0.0 GHSA-xj5x-m3f3-5x3h

References