Electron: Custom protocol with supportFetchAPI but not corsEnabled allows cross-origin reads
Priority LOW 32CWE-942Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0, 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. This issue is fixed in versions 39.8.10, 40.9.3, 41.4.0, and 42.0.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00354 29th percentileScored 2026-11-07
Fix Fixed electron (electron): 39.8.10, 40.9.3, 41.4.0 +1electron (npm): 42.0.0, 41.4.0, 40.9.3 +1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| electron | electron | before 39.8.10; 40.0.0-alpha.1 to before 40.9.3; 41.0.0-alpha.1 to before 41.4.0; 42.0.0-alpha.1 to before 42.0.0 | 39.8.10, 40.9.3, 41.4.0, 42.0.0 | Patch available | CNA |
| — | electron (npm) | 42.0.0-alpha.1 to before 42.0.0 | 42.0.0 | Patch available | GHSA-v3j7-r9gq-3gjw |
| — | electron (npm) | 41.0.0-alpha.1 to before 41.4.0 | 41.4.0 | Patch available | GHSA-v3j7-r9gq-3gjw |
| — | electron (npm) | 40.0.0-alpha.1 to before 40.9.3 | 40.9.3 | Patch available | GHSA-v3j7-r9gq-3gjw |
| — | electron (npm) | before 39.8.10 | 39.8.10 | Patch available | GHSA-v3j7-r9gq-3gjw |
- electron Vendorelectron Affected before 39.8.10; 40.0.0-alpha.1 to before 40.9.3; 41.0.0-alpha.1 to before 41.4.0; 42.0.0-alpha.1 to before 42.0.0 Fixed in 39.8.10, 40.9.3, 41.4.0, 42.0.0 Patch available CNA
- electron (npm) Vendor— Affected 42.0.0-alpha.1 to before 42.0.0 Fixed in 42.0.0 Patch available GHSA-v3j7-r9gq-3gjw
- electron (npm) Vendor— Affected 41.0.0-alpha.1 to before 41.4.0 Fixed in 41.4.0 Patch available GHSA-v3j7-r9gq-3gjw
- electron (npm) Vendor— Affected 40.0.0-alpha.1 to before 40.9.3 Fixed in 40.9.3 Patch available GHSA-v3j7-r9gq-3gjw
- electron (npm) Vendor— Affected before 39.8.10 Fixed in 39.8.10 Patch available GHSA-v3j7-r9gq-3gjw
CPE configurations NVD · 15
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* | before 39.8.10; 40.0.0 to before 40.9.3; 41.0.0 to before 41.4.0 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:alpha1:*:*:*:node.js:*:* | 42.0.0 alpha1 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:alpha2:*:*:*:node.js:*:* | 42.0.0 alpha2 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:alpha3:*:*:*:node.js:*:* | 42.0.0 alpha3 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:alpha4:*:*:*:node.js:*:* | 42.0.0 alpha4 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:alpha5:*:*:*:node.js:*:* | 42.0.0 alpha5 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:alpha6:*:*:*:node.js:*:* | 42.0.0 alpha6 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta1:*:*:*:node.js:*:* | 42.0.0 beta1 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta2:*:*:*:node.js:*:* | 42.0.0 beta2 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta3:*:*:*:node.js:*:* | 42.0.0 beta3 | Vulnerable | Electronjs |
- cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* Versions before 39.8.10; 40.0.0 to before 40.9.3; 41.0.0 to before 41.4.0 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:alpha1:*:*:*:node.js:*:* Versions 42.0.0 alpha1 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:alpha2:*:*:*:node.js:*:* Versions 42.0.0 alpha2 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:alpha3:*:*:*:node.js:*:* Versions 42.0.0 alpha3 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:alpha4:*:*:*:node.js:*:* Versions 42.0.0 alpha4 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:alpha5:*:*:*:node.js:*:* Versions 42.0.0 alpha5 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:alpha6:*:*:*:node.js:*:* Versions 42.0.0 alpha6 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta1:*:*:*:node.js:*:* Versions 42.0.0 beta1 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta2:*:*:*:node.js:*:* Versions 42.0.0 beta2 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta3:*:*:*:node.js:*:* Versions 42.0.0 beta3 Vulnerable ·Electronjs
Show 5 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:electronjs:electron:42.0.0:beta4:*:*:*:node.js:*:* | 42.0.0 beta4 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta5:*:*:*:node.js:*:* | 42.0.0 beta5 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta6:*:*:*:node.js:*:* | 42.0.0 beta6 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta7:*:*:*:node.js:*:* | 42.0.0 beta7 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:42.0.0:beta8:*:*:*:node.js:*:* | 42.0.0 beta8 | Vulnerable | Electronjs |
- cpe:2.3:a:electronjs:electron:42.0.0:beta4:*:*:*:node.js:*:* Versions 42.0.0 beta4 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta5:*:*:*:node.js:*:* Versions 42.0.0 beta5 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta6:*:*:*:node.js:*:* Versions 42.0.0 beta6 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta7:*:*:*:node.js:*:* Versions 42.0.0 beta7 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:42.0.0:beta8:*:*:*:node.js:*:* Versions 42.0.0 beta8 Vulnerable ·Electronjs
Remediation
- Fix · CNA electron (electron) Fixed in 39.8.10, 40.9.3, 41.4.0, 42.0.0
- Fix · GHSA-v3j7-r9gq-3gjw electron (npm) Fixed in 42.0.0 Advisory →
- Fix · GHSA-v3j7-r9gq-3gjw electron (npm) Fixed in 41.4.0 Advisory →
- Fix · GHSA-v3j7-r9gq-3gjw electron (npm) Fixed in 40.9.3 Advisory →
- Fix · GHSA-v3j7-r9gq-3gjw electron (npm) Fixed in 39.8.10 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-70604
- 2026-10-03 Alias added: GHSA-v3j7-r9gq-3gjw
References
More electron vulnerabilities
- TI-2026-39496 Information disclosure in electron-builder CVSS 4.0HIGH 8.2
- TI-2024-26621 Code Signing Bypass on Windows in electron-updater < 6.3.0-alpha.6 CVSS 3.1HIGH 7.5
- TI-2023-09452 Content-Secrity-Policy disabling eval not applied consistently in renderers with sandbox disabled in Electron CVSS 3.1CRITICAL 9.8
- TI-2026-39157 Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow CVSS 4.0CRITICAL 9.3
- TI-2017-09308 GitHub Electron before 1.6.8 allows remote command execution because of a nodeIntegration… CVSS 3.0HIGH 8.1
- TI-2022-11788 Exposure of Resource to Wrong Sphere in Electron CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-70604 · CVE Program
- CVE-2026-70604 · NVD
- FIRST EPSS
- GHSA-v3j7-r9gq-3gjw · GitHub Advisory Database · CC BY 4.0
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