CVE-2026-34769
HIGH
GHSA-9wfr-w7mm-pc7f
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
### Impact An undocumented `commandLineSwitches` webPreference allowed arbitrary switches to be appended to the renderer process command line. Apps that construct `webPreferences` by spreading untrusted configuration objects may inadvertently allow an attacker to inject switches that disable renderer sandboxing or web security controls. Apps are only affected if they construct `webPreferences` from external or untrusted input without an allowlist. Apps that use a fixed, hardcoded `webPreferences` object are not affected. ### Workarounds Do not spread untrusted input into `webPreferences`. Use an explicit allowlist of permitted preference keys when constructing `BrowserWindow` or `webContents` options from external configuration. ### Fixed Versions * `41.0.0-beta.8` * `40.7.0` * `39.8.0` * `38.8.6` ### For more information If there are any questions or comments about this advisory, send an email to [[email protected]](mailto:[email protected])
Analysis
Command line injection in Electron via undocumented commandLineSwitches webPreference enables sandbox escape and security control bypass when applications spread untrusted configuration objects into webPreferences. Attackers can inject arbitrary command-line switches to disable renderer process sandboxing or web security protections, achieving local code execution with elevated privileges. …
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Remediation
Within 24 hours: Identify all Electron-based applications in your environment and document which versions are in use; notify application vendors of exposure. Within 7 days: Implement input validation and sanitization for any application-level configuration objects passed to webPreferences; restrict users' ability to load external or user-supplied configuration files; review Electron security advisories for each affected application. …
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External POC / Exploit Code
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