GHSA-R4W5-6PFG-JXP5

Vulnerability from github – Published: 2026-08-05 16:07 – Updated: 2026-08-05 16:07
VLAI
Summary
Electron: ProtocolResponse.url reuses the default session cache instead of the registering session
Details

Impact

When a custom protocol handler returned a ProtocolResponse with a url and no session, Electron made the upstream request through defaultSession instead of the session that handled the protocol. A cached response could then be reused across otherwise isolated session partitions.

Apps that use ProtocolResponse.url, omit ProtocolResponse.session, and rely on separate sessions to isolate content are affected. Apps that set an explicit session, or that do not isolate content across sessions, are not affected.

Workarounds

Set ProtocolResponse.session explicitly so the request uses the intended session's cache.

Fixed Versions

  • 43.0.0
  • 42.5.1
  • 41.9.1
  • 40.10.6

For more information

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

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "43.0.0-alpha.1"
            },
            {
              "fixed": "43.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "42.0.0-alpha.1"
            },
            {
              "fixed": "42.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "41.0.0-alpha.1"
            },
            {
              "fixed": "41.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "electron"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "40.0.0-alpha.1"
            },
            {
              "fixed": "40.10.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-70606"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-668"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T16:07:59Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nWhen a custom protocol handler returned a `ProtocolResponse` with a `url` and no `session`, Electron made the upstream request through `defaultSession` instead of the session that handled the protocol. A cached response could then be reused across otherwise isolated session partitions.\n\nApps that use `ProtocolResponse.url`, omit `ProtocolResponse.session`, and rely on separate sessions to isolate content are affected. Apps that set an explicit `session`, or that do not isolate content across sessions, are not affected.\n\n### Workarounds\nSet `ProtocolResponse.session` explicitly so the request uses the intended session\u0027s cache.\n\n### Fixed Versions\n* `43.0.0`\n* `42.5.1`\n* `41.9.1`\n* `40.10.6`\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-r4w5-6pfg-jxp5",
  "modified": "2026-08-05T16:07:59Z",
  "published": "2026-08-05T16:07:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/electron/electron"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Electron: ProtocolResponse.url reuses the default session cache instead of the registering session"
}



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