What’s Vulnerable › Vulnerabilities
CVE-2026-34778: Electron: Service worker can spoof executeJavaScript IPC replies
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-04 · updated 2026-07-24
- Weakness: CWE-290
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
- electron: before 38.8.6; from 39.0.0 before 39.8.1; from 40.0.0 before 40.8.1; 41.0.0-alpha1, 41.0.0-alpha2, 41.0.0-alpha3, 41.0.0-alpha4, 41.0.0-alpha5, 41.0.0-alpha6 (+8) — fixed in 38.8.6, 39.8.1, 40.8.1
How to fix
Upgrade to a fixed version: electron 38.8.6, 39.8.1, 40.8.1. Check the vendor advisory for mitigations.
References
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