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High

Electron: Custom protocol with supportFetchAPI but not corsEnabled allows cross-origin reads

  • Disclosed: 05.08.2026
  • Updated: 11.10.2026 10:22

Impact

A custom scheme registered with supportFetchAPI: true but without corsEnabled: true was not subject to CORS enforcement. A page loaded from a remote origin could therefore fetch() or XMLHttpRequest that scheme cross-origin and read the full response body, rather than the read being blocked.

Apps that serve sensitive data from such a scheme and load remote or untrusted content in a renderer are affected. Apps that set corsEnabled: true, or that do not load untrusted content, are not affected.

Workarounds

Set corsEnabled: true on schemes that must enforce CORS, and validate the request Origin in your protocol handler before returning sensitive data.

Fixed Versions

  • 42.0.0
  • 41.4.0
  • 40.9.3
  • 39.8.10

For more information

If you have any questions or comments about this advisory, email Electron at security@electronjs.org

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package electron >= 42.0.0-alpha.1, < 42.0.0, >= 41.0.0-alpha.1, < 41.4.0, >= 40.0.0-alpha.1, < 40.9.3, < 39.8.10 42.0.0, 41.4.0, 40.9.3, 39.8.10

References

CVSS score 7.4/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness (CWE)
CWE-942
Platform
npm
Package
electron
Disclosed
05.08.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-v3j7-r9gq-3gjw - CC BY 4.0

Vulnerability history: electron

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (71) in the archive
Total entries
71
First → latest
10.2017 09.2026
Without a fix
0
Exploited in attacks
3

Severity breakdown

  • Critical 3
  • High 26
  • Medium 32
  • Low 10

Disclosures per year

Severity:
  1. Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab
    High · 8.2 CVE-2026-102673 < 41.10.4, >= 42.0.0-alpha.1, < 42.5.2, >= 43.0.0-alpha.1, < 43.0.0 41.10.4, 42.5.2, 43.0.0
  2. Electron: Windows opened from a sandboxed top-level document do not inherit its sandbox restrictions
    High · 8.2 CVE-2026-102674 < 41.10.6, >= 42.0.0-alpha.1, < 42.9.2, >= 43.0.0-alpha.1, < 43.4.1, >= 44.0.0-alpha.1, < 44.0.0-beta.5 41.10.6, 42.9.2, 43.4.1, 44.0.0-beta.5
  3. Electron: File and HTTP protocol handlers allow cross-origin reads without corsEnabled
    High · 7.4 CVE-2026-102675 < 41.10.6, >= 42.0.0-alpha.1, < 42.9.2, >= 43.0.0-alpha.1, < 43.4.1, >= 44.0.0-alpha.1, < 44.0.0-beta.5 41.10.6, 42.9.2, 43.4.1, 44.0.0-beta.5
  4. Electron: <webview> can enable Node.js integration in Web Workers despite embedder restrictions
    High · 8.3 CVE-2026-102676 < 41.10.6, >= 42.0.0-alpha.1, < 42.9.2, >= 43.0.0-alpha.1, < 43.4.1, >= 44.0.0-alpha.1, < 44.0.0-beta.5 41.10.6, 42.9.2, 43.4.1, 44.0.0-beta.5
  5. Electron: Sandboxed preload code cache can be poisoned by a compromised renderer
    High · 7.8 CVE-2026-102677 >= 42.3.3, < 42.10.0, >= 43.0.0-beta.1, < 43.5.0, >= 44.0.0-alpha.1, < 44.0.0-beta.6 42.10.0, 43.5.0, 44.0.0-beta.6
  6. Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path
    High · 7.2 CVE-2026-70608 >= 42.0.0-alpha.1, < 42.0.1, >= 40.0.0-alpha.1, < 41.10.3, < 39.8.10 42.0.1, 41.10.3, 39.8.10
  7. Electron: Custom protocol with supportFetchAPI but not corsEnabled allows cross-origin reads this entry
    High · 7.4 CVE-2026-70604 >= 42.0.0-alpha.1, < 42.0.0, >= 41.0.0-alpha.1, < 41.4.0, >= 40.0.0-alpha.1, < 40.9.3, < 39.8.10 42.0.0, 41.4.0, 40.9.3, 39.8.10
  8. Electron: Context isolation bypass via Function.prototype.bind hijack
    High · 7.5 CVE-2026-70601 < 39.8.9, >= 40.0.0-alpha.1, < 40.9.2, >= 41.0.0-alpha.1, < 41.2.2, >= 42.0.0-alpha.1, < 42.0.0-beta.5 39.8.9, 40.9.2, 41.2.2, 42.0.0-beta.5
  9. Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
    Critical CVE-2026-54257 >= 42.3.1, < 42.3.3 42.3.3
  10. Electron: Context Isolation bypass via contextBridge VideoFrame transfer
    High · 8.3 CVE-2026-34780 >= 39.0.0-alpha.1, < 39.8.0, >= 40.0.0-alpha.1, < 40.7.0, >= 41.0.0-alpha.1, < 41.0.0-beta.8 39.8.0, 40.7.0, 41.0.0-beta.8
  11. Electron: Use-after-free in offscreen child window paint callback
    High · 8.1 CVE-2026-34774 < 39.8.1, >= 40.0.0-alpha.1, < 40.7.0, >= 41.0.0-alpha.1, < 41.0.0 39.8.1, 40.7.0, 41.0.0
  12. Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks
    High · 7.5 CVE-2026-34771 < 38.8.6, >= 39.0.0-alpha.1, < 39.8.0, >= 40.0.0-alpha.1, < 40.7.0, >= 41.0.0-alpha.1, < 41.0.0-beta.8 38.8.6, 39.8.0, 40.7.0, 41.0.0-beta.8
  13. Electron: Use-after-free in PowerMonitor on Windows and macOS
    High · 7.0 CVE-2026-34770 < 38.8.6, >= 39.0.0-alpha.1, < 39.8.1, >= 40.0.0-alpha.1, < 40.8.0, >= 41.0.0-alpha.1, < 41.0.0-beta.8 38.8.6, 39.8.1, 40.8.0, 41.0.0-beta.8
  14. Electron: Renderer command-line switch injection via undocumented commandLineSwitches webPreference
    High · 7.7 CVE-2026-34769 < 38.8.6, >= 39.0.0-alpha.1, < 39.8.0, >= 40.0.0-alpha.1, < 40.7.0, >= 41.0.0-alpha.1, < 41.0.0-beta.8 38.8.6, 39.8.0, 40.7.0, 41.0.0-beta.8
  15. electron ASAR Integrity bypass by just modifying the content
    High · 7.8 CVE-2024-46992 >= 30.0.0-alpha.1, < 30.0.5, >= 31.0.0-alpha.1, < 31.0.0-beta.1 30.0.5, 31.0.0-beta.1
  16. Electron affected by libvpx's heap buffer overflow in vp8 encoding
    High · 8.8 Exploited in attacks CVE-2023-5217 < 22.3.25, >= 24.0.0, < 24.8.5, >= 25.0.0, < 25.8.4, >= 26.0.0, < 26.2.4, >= 27.0.0-alpha.1, < 27.0.0-beta.8 22.3.25, 24.8.5, 25.8.4, 26.2.4, 27.0.0-beta.8
  17. libwebp: OOB write in BuildHuffmanTable
    High · 8.8 Exploited in attacks CVE-2023-4863 >= 22.0.0, < 22.3.24, >= 24.0.0, < 24.8.3, >= 25.0.0, < 25.8.1, >= 26.0.0, < 26.2.1, >= 27.0.0-beta.1, < 27.0.0-beta.2 22.3.24, 24.8.3, 25.8.1, 26.2.1, 27.0.0-beta.2
  18. Electron's Content-Secrity-Policy disabling eval not applied consistently in renderers with sandbox disabled
    High · 7.5 CVE-2023-23623 >= 22.0.0-beta.1, < 22.0.1, >= 23.0.0-alpha.1, < 23.0.0-alpha.2 22.0.1, 23.0.0-alpha.2
  19. Heap buffer overflow in GPU
    Critical · 9.6 Exploited in attacks CVE-2022-4135 >= 19.0.0, < 19.1.8 19.1.8
  20. Electron vulnerable to remote command execution
    High · 8.1 CVE-2017-12581 < 1.6.8 1.6.8
Show more (9) Showing 20 of 29

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