Vulnerability-Lookup

CVE-2026-70606 (GCVE-0-2026-70606)

Vulnerability from cvelistv5 – Published: 2026-08-05 16:07 – Updated: 2026-08-05 17:23

Title

Electron: ProtocolResponse.url reuses the default session cache instead of the registering session

Summary

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 40.10.6, 41.9.1, 42.5.1, and 43.0.0, 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. This issue is fixed in versions 40.10.6, 41.9.1, 42.5.1, and 43.0.0.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-668 - Exposure of Resource to Wrong Sphere

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: >= 40.0.0-alpha.1, < 40.10.6 Affected: >= 41.0.0-alpha.1, < 41.9.1 Affected: >= 42.0.0-alpha.1, < 42.5.1 Affected: >= 43.0.0-alpha.1, < 43.0.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-70606",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-05T17:15:44.765454Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-05T17:23:30.639Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "electron",
          "vendor": "electron",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 40.0.0-alpha.1, \u003c 40.10.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 41.0.0-alpha.1, \u003c 41.9.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 42.0.0-alpha.1, \u003c 42.5.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 43.0.0-alpha.1, \u003c 43.0.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 40.10.6, 41.9.1, 42.5.1, and 43.0.0, 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. This issue is fixed in versions 40.10.6, 41.9.1, 42.5.1, and 43.0.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-668",
              "description": "CWE-668: Exposure of Resource to Wrong Sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T16:07:46.008Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5"
        }
      ],
      "source": {
        "advisory": "GHSA-r4w5-6pfg-jxp5",
        "discovery": "UNKNOWN"
      },
      "title": "Electron: ProtocolResponse.url reuses the default session cache instead of the registering session"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-70606",
    "datePublished": "2026-08-05T16:07:46.008Z",
    "dateReserved": "2026-08-04T19:50:27.328Z",
    "dateUpdated": "2026-08-05T17:23:30.639Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-70606",
      "date": "2026-08-09",
      "epss": "0.00157",
      "percentile": "0.05303"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-70606\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-05T16:17:04.953\",\"lastModified\":\"2026-08-05T18:17:15.043\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 40.10.6, 41.9.1, 42.5.1, and 43.0.0, 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. This issue is fixed in versions 40.10.6, 41.9.1, 42.5.1, and 43.0.0.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"electron\",\"product\":\"electron\",\"versions\":[{\"version\":\"\u003e= 40.0.0-alpha.1, \u003c 40.10.6\",\"status\":\"affected\"},{\"version\":\"\u003e= 41.0.0-alpha.1, \u003c 41.9.1\",\"status\":\"affected\"},{\"version\":\"\u003e= 42.0.0-alpha.1, \u003c 42.5.1\",\"status\":\"affected\"},{\"version\":\"\u003e= 43.0.0-alpha.1, \u003c 43.0.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.6,\"impactScore\":4.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-05T17:15:44.765454Z\",\"id\":\"CVE-2026-70606\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-668\"}]}],\"references\":[{\"url\":\"https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5\",\"source\":\"security-advisories@github.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-70606\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-05T17:15:44.765454Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-05T17:23:21.523Z\"}}], \"cna\": {\"title\": \"Electron: ProtocolResponse.url reuses the default session cache instead of the registering session\", \"source\": {\"advisory\": \"GHSA-r4w5-6pfg-jxp5\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"electron\", \"product\": \"electron\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 40.0.0-alpha.1, \u003c 40.10.6\"}, {\"status\": \"affected\", \"version\": \"\u003e= 41.0.0-alpha.1, \u003c 41.9.1\"}, {\"status\": \"affected\", \"version\": \"\u003e= 42.0.0-alpha.1, \u003c 42.5.1\"}, {\"status\": \"affected\", \"version\": \"\u003e= 43.0.0-alpha.1, \u003c 43.0.0\"}]}], \"references\": [{\"url\": \"https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5\", \"name\": \"https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 40.10.6, 41.9.1, 42.5.1, and 43.0.0, 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. This issue is fixed in versions 40.10.6, 41.9.1, 42.5.1, and 43.0.0.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-668\", \"description\": \"CWE-668: Exposure of Resource to Wrong Sphere\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-08-05T16:07:46.008Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-70606\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T17:23:30.639Z\", \"dateReserved\": \"2026-08-04T19:50:27.328Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-08-05T16:07:46.008Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

GHSA-R4W5-6PFG-JXP5

Vulnerability from github – Published: 2026-08-05 16:07 – Updated: 2026-08-05 16:07

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

JSON

To clipboard

{
  "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"
}

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.

Action not permitted