Vulnerability-Lookup

CVE-2026-70607 (GCVE-0-2026-70607)

Vulnerability from cvelistv5 – Published: 2026-08-05 16:24 – Updated: 2026-08-05 18:27

Title

Electron: window.open features string controls some window options considered privileged

Summary

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, 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, when untrusted content can call window.open() and the app does not override child window options via setWindowOpenHandler or overrideBrowserWindowOptions. This issue is fixed in 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M

References

13 references

URL	Tags
https://github.com/electron/electron/security/adv…	x_refsource_CONFIRM
https://github.com/electron/electron/pull/50946	x_refsource_MISC
https://github.com/electron/electron/pull/50947	x_refsource_MISC
https://github.com/electron/electron/pull/50948	x_refsource_MISC
https://github.com/electron/electron/pull/50949	x_refsource_MISC
https://github.com/electron/electron/commit/30cf3…	x_refsource_MISC
https://github.com/electron/electron/commit/4eff3…	x_refsource_MISC
https://github.com/electron/electron/commit/615d6…	x_refsource_MISC
https://github.com/electron/electron/commit/fe2e7…	x_refsource_MISC
https://github.com/electron/electron/releases/tag…	x_refsource_MISC
https://github.com/electron/electron/releases/tag…	x_refsource_MISC
https://github.com/electron/electron/releases/tag…	x_refsource_MISC
https://github.com/electron/electron/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
electron	electron	Affected: < 39.8.8 Affected: >= 40.0.0-alpha.1, < 40.9.0 Affected: >= 41.0.0-alpha.1, < 41.2.1 Affected: >= 42.0.0-alpha.1, < 42.0.0-beta.3

Show details on NVD website

JSON

To clipboard

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GHSA-V93F-FGJR-HJRJ

Vulnerability from github – Published: 2026-08-05 16:24 – Updated: 2026-08-05 16:24

Summary

Electron: window.open features string controls some window options considered privileged

Details

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

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

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    "github_reviewed_at": "2026-08-05T16:24:17Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "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: \u0027deny\u0027 }` 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)",
  "id": "GHSA-v93f-fgjr-hjrj",
  "modified": "2026-08-05T16:24:17Z",
  "published": "2026-08-05T16:24:17Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Electron: window.open features string controls some window options considered privileged"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

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