CVE-2026-34778
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In Electron prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, a service worker running in a session can 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.
Risk Assessment
Applications that use the results of webContents.executeJavaScript() or webFrameMain.executeJavaScript() in security-sensitive decisions are vulnerable to data manipulation by an attacker, potentially leading to integrity and confidentiality breaches.
Recommendation
Immediately update Electron to version 38.8.6, 39.8.1, 40.8.1, or 41.0.0. Also review whether the application registers service workers and uses executeJavaScript results in critical decisions.
Original NVD description (English source)
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.