Vulnerability-Lookup

CVE-2026-70602 (GCVE-0-2026-70602)

Vulnerability from cvelistv5 – Published: 2026-08-05 15:54 – Updated: 2026-08-05 16:13

Title

Electron: Extension tab APIs operate across session boundaries

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, extension tab and scripting APIs were not scoped to the extension's own session. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session. Apps are only affected if they load Chrome extensions via session.loadExtension and rely on separate sessions to isolate that extension from other content. This issue is fixed in versions 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

Severity

6.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-284 - Improper Access Control

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/electron/electron/security/adv…	x_refsource_CONFIRM

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

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JSON

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GHSA-M55F-7GQJ-FR98

Vulnerability from github – Published: 2026-08-05 15:57 – Updated: 2026-08-05 15:57

Summary

Electron: Extension tab APIs operate across session boundaries

Details

Impact

Extension tab and scripting APIs were not scoped to the extension's own session. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session.

Apps are only affected if they load Chrome extensions via session.loadExtension and rely on separate sessions to isolate that extension from other content. Apps that do not load extensions, or that use a single session, are not affected.

Workarounds

Only load extensions from sources you trust; do not rely on session separation alone to contain an extension.

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

6.6 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "39.8.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "40.0.0-alpha.1"
            },
            {
              "fixed": "40.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "41.0.0-alpha.1"
            },
            {
              "fixed": "41.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "42.0.0-alpha.1"
            },
            {
              "fixed": "42.0.0-beta.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-70602"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T15:57:11Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nExtension tab and scripting APIs were not scoped to the extension\u0027s own `session`. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session.\n\nApps are only affected if they load Chrome extensions via `session.loadExtension` and rely on separate sessions to isolate that extension from other content. Apps that do not load extensions, or that use a single session, are not affected.\n\n### Workarounds\nOnly load extensions from sources you trust; do not rely on session separation alone to contain an extension.\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-m55f-7gqj-fr98",
  "modified": "2026-08-05T15:57:11Z",
  "published": "2026-08-05T15:57:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/security/advisories/GHSA-m55f-7gqj-fr98"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/electron/electron"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Electron: Extension tab APIs operate across session boundaries"
}

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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