CVE-2026-34769

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8, 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. This issue has been patched in versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8, 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. This issue has been patched in versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8.

### 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 [security@electronjs.org](mailto:security@electronjs.org)

### 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 [security@electronjs.org](mailto:security@electronjs.org)