GHSA-9F4C-93C8-JC8G

Vulnerability from github – Published: 2026-08-05 17:27 – Updated: 2026-08-05 17:27
VLAI
Summary
Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path
Details

Impact

A sandboxed iframe without the allow-popups keyword could still open a new window (or trigger setWindowOpenHandler) with no user interaction, because new-window navigations taking the OpenURL path did not apply the iframe sandbox popup restriction.

Apps that embed untrusted content in sandboxed iframes and rely on the absence of allow-popups to prevent window creation are affected. Apps that deny window creation in setWindowOpenHandler, or that do not embed untrusted content in sandboxed iframes, are not affected.

Workarounds

Return { action: 'deny' } from setWindowOpenHandler for any content you do not trust, rather than relying on the iframe sandbox alone.

Fixed Versions

  • 42.0.1
  • 41.10.3
  • 39.8.10

For more information

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

Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "42.0.0-alpha.1"
            },
            {
              "fixed": "42.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "40.0.0-alpha.1"
            },
            {
              "fixed": "41.10.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "39.8.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-70608"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-693",
      "CWE-1021"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T17:27:18Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nA sandboxed iframe without the `allow-popups` keyword could still open a new window (or trigger `setWindowOpenHandler`) with no user interaction, because new-window navigations taking the OpenURL path did not apply the iframe sandbox popup restriction.\n\nApps that embed untrusted content in sandboxed iframes and rely on the absence of `allow-popups` to prevent window creation are affected. Apps that deny window creation in `setWindowOpenHandler`, or that do not embed untrusted content in sandboxed iframes, are not affected.\n\n### Workarounds\nReturn `{ action: \u0027deny\u0027 }` from `setWindowOpenHandler` for any content you do not trust, rather than relying on the iframe sandbox alone.\n\n### Fixed Versions\n* `42.0.1`\n* `41.10.3`\n* `39.8.10`\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-9f4c-93c8-jc8g",
  "modified": "2026-08-05T17:27:18Z",
  "published": "2026-08-05T17:27:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/security/advisories/GHSA-9f4c-93c8-jc8g"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51437"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51438"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51439"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/electron/electron"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v39.8.10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v41.10.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v42.0.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.