CVE-2026-70600: Electron Cross-origin Iframe Can Position Native Vulnerability

LOW
Advisory Identifier: GHSA-x8rc-wpg4-grpf
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CVSS 3.1
CWE-1021
Published
Advisory Summary

CVE-2026-70600 is a LOW (CVSS 3.1) cross-origin iframe can position native vulnerability (CWE-1021: Improper Restriction of Rendered UI Layers or Frames) affecting Electron libraries in the npm ecosystem. The issue involves cross-origin iframe can position native autofill popup. Remediation is available by upgrading affected packages to version 39.8.8, 40.9.1, 41.2.1, 42.0.0-beta.3.

CVE-2026-70600 at a Glance

CVE Identifier CVE-2026-70600
GHSA Identifier GHSA-x8rc-wpg4-grpf
Severity LOW
CVSS v3.1 Base Score 3.1
CWE Classification CWE-1021: Improper Restriction of Rendered UI Layers or Frames
Affected Product Electron
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 3.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-70600

To remediate this vulnerability, upgrade all affected Electron dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

electron fixed: 39.8.8 
npm install electron@39.8.8
electron fixed: 40.9.1 
npm install electron@40.9.1
electron fixed: 41.2.1 
npm install electron@41.2.1
electron fixed: 42.0.0-beta.3 
npm install electron@42.0.0-beta.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls electron

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-70600, inspect your project dependencies using npm:

npm ls electron

Analyze the terminal output to locate any version of Electron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 39.8.8), your application is affected.

Note: The npm ls electron command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1021: Improper Restriction of Rendered UI Layers or Frames, where the web application does not restrict or incorrectly restricts frame objects or ui layers that belong to another application or domain. In Electron, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact The native autofill popup could be positioned by a cross-origin iframe outside that iframe's bounds, over the embedding page's UI, enabling clickjacking or spoofing of trusted UI. Apps are only affected if they embed untrusted content in iframes within windows that also display trusted UI. Apps that do not embed untrusted third-party content are not affected. ### Workarounds Do not embed untrusted content in iframes inside windows that display trusted UI. ### Fixed Versions * `42.0.0-beta.3` * `41.2.1` * `40.9.0` * `39.8.8` ### For more information If you have any questions or comments about this advisory, email Electron at [security@electronjs.org](mailto:security@electronjs.org)

CVE-2026-70600 Affected Electron Versions

4 component(s)
Fixed Versions:
39.8.840.9.141.2.142.0.0-beta.3
Product / Package Ecosystem Affected Versions Fixed Version
electron
npm/electron
npm
< 39.8.8
39.8.8
electron
npm/electron
npm
≥ 40.0.0-alpha.1
< 40.9.1
40.9.1
electron
npm/electron
npm
≥ 41.0.0-alpha.1
< 41.2.1
41.2.1
electron
npm/electron
npm
≥ 42.0.0-alpha.1
< 42.0.0-beta.3
42.0.0-beta.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/electron/electron/security/advisories/GHSA-x8rc-wpg4-grpf
Electron Source Repository REPOSITORY
https://github.com/electron/electron

Frequently Asked Questions

What is CVE-2026-70600?
CVE-2026-70600 is a security vulnerability in Electron involving Cross-origin iframe can position native autofill popup under CWE-1021: Improper Restriction of Rendered UI Layers or Frames.
Which Electron versions are affected?
Affected versions include releases prior to 39.8.8, 40.9.1, 41.2.1, 42.0.0-beta.3 across affected packages: electron.
What version fixes CVE-2026-70600?
Upgrading to 39.8.8, 40.9.1, 41.2.1, 42.0.0-beta.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is electron affected?
Yes, electron is affected in releases prior to 39.8.8, 40.9.1, 41.2.1, 42.0.0-beta.3. Upgrade your dependency to 39.8.8, 40.9.1, 41.2.1, 42.0.0-beta.3 or later.
What is the CVSS score of CVE-2026-70600?
CVE-2026-70600 has a CVSS v3.1 base score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-70600?
CVE-2026-70600 is classified under CWE-1021: Improper Restriction of Rendered UI Layers or Frames (The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain.).
How can I check npm dependencies for CVE-2026-70600?
Run the dependency tree command: 'npm ls electron'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-x8rc-wpg4-grpf",
  "modified" : "2026-08-05T15:40:32Z",
  "published" : "2026-08-05T15:40:32Z",
  "aliases" : [ "CVE-2026-70600" ],
  "summary" : "Electron: Cross-origin iframe can position native autofill popup",
  "details" : "### Impact\nThe native autofill popup could be positioned by a cross-origin iframe outside that iframe's bounds, over the embedding page's UI, enabling clickjacking or spoofing of trusted UI.\n\nApps are only affected if they embed untrusted content in iframes within windows that also display trusted UI. Apps that do not embed untrusted third-party content are not affected.\n\n### Workarounds\nDo not embed untrusted content in iframes inside windows that display trusted UI.\n\n### Fixed Versions\n* `42.0.0-beta.3`\n* `41.2.1`\n* `40.9.0`\n* `39.8.8`\n\n### For more information\nIf you have any questions or comments about this advisory, email Electron at [security@electronjs.org](mailto:security@electronjs.org)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "39.8.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "40.0.0-alpha.1"
      }, {
        "fixed" : "40.9.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 40.9.0"
    }
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "41.0.0-alpha.1"
      }, {
        "fixed" : "41.2.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "42.0.0-alpha.1"
      }, {
        "fixed" : "42.0.0-beta.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/security/advisories/GHSA-x8rc-wpg4-grpf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/electron/electron"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1021" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-05T15:40:32Z",
    "nvd_published_at" : null
  }
}