Electron: Renderer command-line switch injection via undocumented commandLineSwitches webPreference

CVE-2026-34769 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

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]

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-04-03 02:39:15 UTC
Updated
2026-04-06 23:10:38 UTC
GitHub reviewed
2026-04-03 02:39:15 UTC
NVD published
2026-04-03

EPSS Score

Score Percentile
0.02% 5.96%

CVSS Scores

Base score Version Severity Vector
7.8 3.1 —
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-9wfr-w7mm-pc7f ↗
CVE CVE-2026-34769 ↗

CWEs

CWE id Name
CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CWE-912 Hidden Functionality

Affected packages (4)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm electron < 38.8.6 38.8.6 —
npm electron >= 39.0.0-alpha.1, < 39.8.0 39.8.0 —
npm electron >= 40.0.0-alpha.1, < 40.7.0 40.7.0 —
npm electron >= 41.0.0-alpha.1, < 41.0.0-beta.8 41.0.0-beta.8 —

References

cvelogic Threat Intelligence