Vulnerability-Lookup

CVE-2026-70610 (GCVE-0-2026-70610)

Vulnerability from cvelistv5 – Published: 2026-08-05 17:41 – Updated: 2026-08-06 14:31

Title

Electron: contextBridge object copy honors prototype setters

Summary

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4, objects copied across the contextBridge boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled. Apps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks, while apps that only accept primitive arguments or validate object arguments are not affected. This issue is fixed in 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4.

Severity

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M

References

13 references

URL	Tags
https://github.com/electron/electron/security/adv…	x_refsource_CONFIRM
https://github.com/electron/electron/pull/51083	x_refsource_MISC
https://github.com/electron/electron/pull/51084	x_refsource_MISC
https://github.com/electron/electron/pull/51085	x_refsource_MISC
https://github.com/electron/electron/pull/51086	x_refsource_MISC
https://github.com/electron/electron/commit/17d5d…	x_refsource_MISC
https://github.com/electron/electron/commit/23a6e…	x_refsource_MISC
https://github.com/electron/electron/commit/4ac50…	x_refsource_MISC
https://github.com/electron/electron/commit/5b699…	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: < 39.8.9 Affected: >= 40.0.0-alpha.1, < 40.9.2 Affected: >= 41.0.0-alpha.1, < 41.2.2 Affected: >= 42.0.0-alpha.1, < 42.0.0-beta.4

Show details on NVD website

JSON

To clipboard

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GHSA-FF2P-HMQR-HXM4

Vulnerability from github – Published: 2026-08-05 17:41 – Updated: 2026-08-05 17:41

Summary

Electron: contextBridge object copy honors prototype setters

Details

Impact

Objects copied across the contextBridge boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled.

Apps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks. Apps that only accept primitive arguments, or that validate object arguments, are not affected.

Workarounds

Validate objects received from untrusted content with own-property checks (Object.hasOwn), or copy them onto a null-prototype object before use.

Fixed Versions

42.0.0-beta.4
41.2.2
40.9.2
39.8.9

For more information

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

Severity

5.4 (Medium)


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

Show details on source website

JSON

To clipboard

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  "aliases": [
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  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
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    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T17:41:20Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nObjects copied across the `contextBridge` boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled.\n\nApps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks. Apps that only accept primitive arguments, or that validate object arguments, are not affected.\n\n### Workarounds\nValidate objects received from untrusted content with own-property checks (`Object.hasOwn`), or copy them onto a null-prototype object before use.\n\n### Fixed Versions\n* `42.0.0-beta.4`\n* `41.2.2`\n* `40.9.2`\n* `39.8.9`\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-ff2p-hmqr-hxm4",
  "modified": "2026-08-05T17:41:21Z",
  "published": "2026-08-05T17:41:20Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr-hxm4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51083"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51084"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51085"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/pull/51086"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/17d5d26499cd279fab48f5f26527f8edc02a7713"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/23a6efb714dec80e2cf45d3054d18d701162e4dd"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/4ac50292d552fb510eb778392620c85308770a55"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/commit/5b699544cbbed51bedb7c60d75c8c42be5825737"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/electron/electron"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v39.8.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v40.9.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v41.2.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/releases/tag/v42.0.0-beta.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Electron: contextBridge object copy honors prototype setters"
}

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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