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TI-2024-26621 Aliases CVE-2024-39698GHSA-9jxc-qjr9-vjxq

Code Signing Bypass on Windows in electron-updater < 6.3.0-alpha.6

Priority HIGH 68CWE-154Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

electron-updater allows for automatic updates for Electron apps. The file `packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts` implements the signature validation routine for Electron applications on Windows. Because of the surrounding shell, a first pass by `cmd.exe` expands any environment variable found in command-line above. This creates a situation where `verifySignature()` can be tricked into validating the certificate of a different file than the one that was just downloaded. If the step is successful, the malicious update will be executed even if its signature is invalid. This attack assumes a compromised update manifest (server compromise, Man-in-the-Middle attack if fetched over HTTP, Cross-Site Scripting to point the application to a malicious updater server, etc.). The patch is available starting from 6.3.0-alpha.6.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00425 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed electron-builder (electron-userland): 6.3.0-alpha.6electron-updater (npm): 6.3.0-alpha.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
electronelectron-builderbefore 6.3.0-alpha.66.3.0-alpha.6Patch availableCNA
—electron-updater (npm)before 6.3.0-alpha.66.3.0-alpha.6Patch availableGHSA-9jxc-qjr9-vjxq
  • electron-builder Vendorelectron Affected before 6.3.0-alpha.6 Fixed in 6.3.0-alpha.6 Patch available CNA
  • electron-updater (npm) Vendor— Affected before 6.3.0-alpha.6 Fixed in 6.3.0-alpha.6 Patch available GHSA-9jxc-qjr9-vjxq

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:electron:electron-builder:*:*:*:*:*:node.js:*:*before 6.3.0Vulnerableelectron
cpe:2.3:a:electron:electron-builder:6.3.0:alpha0:*:*:*:node.js:*:*6.3.0 alpha0Vulnerableelectron
cpe:2.3:a:electron:electron-builder:6.3.0:alpha1:*:*:*:node.js:*:*6.3.0 alpha1Vulnerableelectron
cpe:2.3:a:electron:electron-builder:6.3.0:alpha2:*:*:*:node.js:*:*6.3.0 alpha2Vulnerableelectron
cpe:2.3:a:electron:electron-builder:6.3.0:alpha3:*:*:*:node.js:*:*6.3.0 alpha3Vulnerableelectron
cpe:2.3:a:electron:electron-builder:6.3.0:alpha4:*:*:*:node.js:*:*6.3.0 alpha4Vulnerableelectron
cpe:2.3:a:electron:electron-builder:6.3.0:alpha5:*:*:*:node.js:*:*6.3.0 alpha5Vulnerableelectron
  • cpe:2.3:a:electron:electron-builder:*:*:*:*:*:node.js:*:* Versions before 6.3.0 Vulnerable ·electron
  • cpe:2.3:a:electron:electron-builder:6.3.0:alpha0:*:*:*:node.js:*:* Versions 6.3.0 alpha0 Vulnerable ·electron
  • cpe:2.3:a:electron:electron-builder:6.3.0:alpha1:*:*:*:node.js:*:* Versions 6.3.0 alpha1 Vulnerable ·electron
  • cpe:2.3:a:electron:electron-builder:6.3.0:alpha2:*:*:*:node.js:*:* Versions 6.3.0 alpha2 Vulnerable ·electron
  • cpe:2.3:a:electron:electron-builder:6.3.0:alpha3:*:*:*:node.js:*:* Versions 6.3.0 alpha3 Vulnerable ·electron
  • cpe:2.3:a:electron:electron-builder:6.3.0:alpha4:*:*:*:node.js:*:* Versions 6.3.0 alpha4 Vulnerable ·electron
  • cpe:2.3:a:electron:electron-builder:6.3.0:alpha5:*:*:*:node.js:*:* Versions 6.3.0 alpha5 Vulnerable ·electron

Remediation

  • Fix · CNA electron-builder (electron-userland) Fixed in 6.3.0-alpha.6
  • Fix · GHSA-9jxc-qjr9-vjxq electron-updater (npm) Fixed in 6.3.0-alpha.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-39698
  2. 2026-10-03 Alias added: GHSA-9jxc-qjr9-vjxq

References

Exploit 1

Patch 2

Advisory 1

Other 2

  • TI-2026-39496 Information disclosure in electron-builder CVSS 4.0HIGH 8.2
  • TI-2026-39495 electron-updater: Uncontrolled search path elements within `AppImage` built by `app-builder-lib` CVSS 3.1HIGH 7.8
  • TI-2024-18141 electron-builder's NSIS installer - execute arbitrary code on the target machine (Windows only) CVSS 3.1HIGH 7.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences