{
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    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-85268",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
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                "timestamp": "2026-10-30T16:48:10.216800Z",
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          "dateUpdated": "2026-10-30T16:48:22.519Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "platforms": [
            "iOS"
          ],
          "product": "Identity Platform and Firebase Authentication",
          "vendor": "Google Cloud",
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              "status": "affected",
              "version": "0",
              "versionType": "date"
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      "credits": [
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          "lang": "en",
          "type": "reporter",
          "value": "Mathias Karlsson"
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      ],
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
              "value": "\u003cp\u003eA Cross-Site Scripting (XSS) (CWE-79) vulnerability in the auth/handler in Google Cloud Identity Platform and Firebase Authentication versions prior to 2026-08-14 on iOS allows an unauthenticated remote attacker to execute arbitrary JavaScript using a malicious iOS bundle ID.\u003c/p\u003e"
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          ],
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        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-63",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-63 Cross-Site Scripting (XSS)"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/U:Amber",
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            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or \u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
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          ]
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      "providerMetadata": {
        "dateUpdated": "2026-10-30T10:20:06.249Z",
        "orgId": "f45cbf4e-4146-4068-b7e1-655ffc2c548c",
        "shortName": "GoogleCloud"
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      "references": [
        {
          "url": "https://firebase.google.com/support/releases#auth-helper-fix"
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      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
              "value": "This vulnerability has been patched for all users and no app updates are required. Action is only needed for developers who followed Option 4 (self-hosting the helper code) in the \u003ca href=\"https://firebase.google.com/docs/auth/web/redirect-best-practices#self-host-helper-code\"\u003eFirebase redirect best practices documentation\u003c/a\u003e. These users should re-synchronize the helper code to make sure they are hosting the latest version."
            }
          ],
          "value": "This vulnerability has been patched for all users and no app updates are required. Action is only needed for developers who followed Option 4 (self-hosting the helper code) in the Firebase redirect best practices documentation https://firebase.google.com/docs/auth/web/redirect-best-practices#self-host-helper-code. These users should re-synchronize the helper code to make sure they are hosting the latest version."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID",
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    "datePublished": "2026-10-30T10:20:06.249Z",
    "dateReserved": "2026-09-03T16:36:41.159Z",
    "dateUpdated": "2026-10-30T16:48:22.519Z",
    "state": "PUBLISHED"
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}