CVE-2026-70607: Electron Window.open Features String Controls Some Vulnerability

MODERATE
Advisory Identifier: GHSA-v93f-fgjr-hjrj
Share
CVSS 5.3
CWE-20
Published
Advisory Summary

CVE-2026-70607 is a MODERATE (CVSS 5.3) window.open features string controls some vulnerability (CWE-20: Improper Input Validation) affecting Electron libraries in the npm ecosystem. The issue involves window.open features string controls some window options considered privileged. Remediation is available by upgrading affected packages to version 39.8.8, 40.9.0, 41.2.1, 42.0.0-beta.3.

CVE-2026-70607 at a Glance

CVE Identifier CVE-2026-70607
GHSA Identifier GHSA-v93f-fgjr-hjrj
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-20: Improper Input Validation
Affected Product Electron
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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

How to Fix CVE-2026-70607

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: 40.9.0 
npm install electron@40.9.0
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-2026-70607, 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. 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 Some window options supplied by web content in the `window.open()` features string were applied to the new `BrowserWindow` without an allowlist. Untrusted content could set window options it should not control, including options that cause the main process to access attacker-chosen file or network paths. Apps are only affected if untrusted content can call `window.open()` and the app does not override child window options via `setWindowOpenHandler`. Apps that deny `window.open()` for untrusted content, or set `overrideBrowserWindowOptions` explicitly, are not affected. ### Workarounds Return `{ action: 'deny' }` from `setWindowOpenHandler` for untrusted content, or supply `overrideBrowserWindowOptions` so every window option is set explicitly. ### 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-2026-70607 Affected Electron Versions

4 component(s)
Fixed Versions:
39.8.840.9.041.2.142.0.0-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
< 40.9.0
40.9.0
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-v93f-fgjr-hjrj
Electron Source Repository REPOSITORY
https://github.com/electron/electron/pull/50946
Electron Source Repository REPOSITORY
https://github.com/electron/electron/pull/50947
Electron Source Repository REPOSITORY
https://github.com/electron/electron/pull/50948
Electron Source Repository REPOSITORY
https://github.com/electron/electron/pull/50949
Security Fix Commit FIX COMMIT
https://github.com/electron/electron/commit/30cf3882de75ee651bd4e5f27002f13fd3d3163a
Security Fix Commit FIX COMMIT
https://github.com/electron/electron/commit/4eff3dc09e4d1e62d649c5ce9902f532bb7469c7
Security Fix Commit FIX COMMIT
https://github.com/electron/electron/commit/615d62500fc7732d068274b796c49487e652e90b
Security Fix Commit FIX COMMIT
https://github.com/electron/electron/commit/fe2e7d0073949b4593b624b93abf1788f5377e55
Electron Source Repository REPOSITORY
https://github.com/electron/electron
Electron Release RELEASE
https://github.com/electron/electron/releases/tag/v39.8.8
Electron Release RELEASE
https://github.com/electron/electron/releases/tag/v40.9.0
Electron Release RELEASE
https://github.com/electron/electron/releases/tag/v41.2.1
Electron Release RELEASE
https://github.com/electron/electron/releases/tag/v42.0.0-beta.3

Frequently Asked Questions

What is CVE-2026-70607?
CVE-2026-70607 is a security vulnerability in Electron involving window.open features string controls some window options considered privileged under CWE-20: Improper Input Validation.
Which Electron versions are affected?
Affected versions include releases prior to 39.8.8, 40.9.0, 41.2.1, 42.0.0-beta.3 across affected packages: electron.
What version fixes CVE-2026-70607?
Upgrading to 39.8.8, 40.9.0, 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, 40.9.0, 41.2.1, 42.0.0-beta.3. Upgrade your dependency to 39.8.8, 40.9.0, 41.2.1, 42.0.0-beta.3 or later.
What is the CVSS score of CVE-2026-70607?
CVE-2026-70607 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-70607?
CVE-2026-70607 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check npm dependencies for CVE-2026-70607?
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-v93f-fgjr-hjrj",
  "modified" : "2026-08-05T16:24:17Z",
  "published" : "2026-08-05T16:24:17Z",
  "aliases" : [ "CVE-2026-70607" ],
  "summary" : "Electron: window.open features string controls some window options considered privileged",
  "details" : "### Impact\nSome window options supplied by web content in the `window.open()` features string were applied to the new `BrowserWindow` without an allowlist. Untrusted content could set window options it should not control, including options that cause the main process to access attacker-chosen file or network paths.\n\nApps are only affected if untrusted content can call `window.open()` and the app does not override child window options via `setWindowOpenHandler`. Apps that deny `window.open()` for untrusted content, or set `overrideBrowserWindowOptions` explicitly, are not affected.\n\n### Workarounds\nReturn `{ action: 'deny' }` from `setWindowOpenHandler` for untrusted content, or supply `overrideBrowserWindowOptions` so every window option is set explicitly.\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:L/PR:N/UI:N/S:U/C:L/I:N/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" : "40.9.0"
      } ]
    } ]
  }, {
    "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-v93f-fgjr-hjrj"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/pull/50946"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/pull/50947"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/pull/50948"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/pull/50949"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/commit/30cf3882de75ee651bd4e5f27002f13fd3d3163a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/commit/4eff3dc09e4d1e62d649c5ce9902f532bb7469c7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/commit/615d62500fc7732d068274b796c49487e652e90b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/commit/fe2e7d0073949b4593b624b93abf1788f5377e55"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/electron/electron"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v39.8.8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v40.9.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v41.2.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v42.0.0-beta.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-05T16:24:17Z",
    "nvd_published_at" : null
  }
}