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GHSA-xj5x-m3f3-5x3h

Electron: Service worker can spoof executeJavaScript IPC replies

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-34778

Packages

EcosystemPackageAffectedFixed in
npm electron < 38.8.6 38.8.6
npm electron >= 39.0.0-alpha.1, < 39.8.1 39.8.1
npm electron >= 40.0.0-alpha.1, < 40.8.1 40.8.1
npm electron >= 41.0.0-alpha.1, < 41.0.0 41.0.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact 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. ### Workarounds Do not trust the return value of `webContents.executeJavaScript()` for security decisions. Use dedicated, validated IPC channels for security-relevant communication with renderers. ### Fixed Versions * `41.0.0` * `40.8.1` * `39.8.1` * `38.8.6` ### For more information If there are any questions or comments about this advisory, please email [[email protected]](mailto:[email protected])

References

External links from the advisory. They lead to third-party sites.