Vulnerability-Lookup

GHSA-9F4C-93C8-JC8G

Vulnerability from github – Published: 2026-08-05 17:27 – Updated: 2026-08-05 17:27

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

JSON

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{
  "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-1021",
      "CWE-693"
    ],
    "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"
}

CVE-2026-70608 (GCVE-0-2026-70608)

Vulnerability from cvelistv5 – Published: 2026-08-05 17:27 – Updated: 2026-08-05 18:46

Title

Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path

Summary

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 41.10.3, and 42.0.1, 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, while apps that deny window creation in setWindowOpenHandler or do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in 39.8.10, 41.10.3, and 42.0.1.

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-05 18:14 UTC

CWE

CWE-693 - Protection Mechanism Failure
CWE-1021 - Improper Restriction of Rendered UI Layers or Frames

Assigner

GitHub_M mitre root Scorecard

References

10 references

URL	Tags
https://github.com/electron/electron/security/adv…	x_refsource_CONFIRM
https://github.com/electron/electron/pull/51437	x_refsource_MISC
https://github.com/electron/electron/pull/51438	x_refsource_MISC
https://github.com/electron/electron/pull/51439	x_refsource_MISC
https://github.com/electron/electron/commit/3ff23…	x_refsource_MISC
https://github.com/electron/electron/commit/57cbe…	x_refsource_MISC
https://github.com/electron/electron/commit/68cf8…	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: < 39.8.10 Affected: >= 40.0.0-alpha.1, < 41.10.3 Affected: >= 42.0.0-alpha.1, < 42.0.1

Show details on NVD website

JSON

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                "id": "CVE-2026-70608",
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                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-05T18:14:00.193334Z",
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            "attackComplexity": "LOW",
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            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
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    "datePublished": "2026-08-05T17:27:15.743Z",
    "dateReserved": "2026-08-04T19:50:27.329Z",
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}

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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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