{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-85268", "assignerOrgId": "f45cbf4e-4146-4068-b7e1-655ffc2c548c", "state": "PUBLISHED", "assignerShortName": "GoogleCloud", "dateReserved": "2026-09-03T16:36:41.159Z", "datePublished": "2026-10-30T10:20:06.249Z", "dateUpdated": "2026-10-30T10:20:06.249Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f45cbf4e-4146-4068-b7e1-655ffc2c548c", "shortName": "GoogleCloud", "dateUpdated": "2026-10-30T10:20:06.249Z"}, "title": "Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-63", "descriptions": [{"lang": "en", "value": "CAPEC-63 Cross-Site Scripting (XSS)"}]}], "affected": [{"vendor": "Google Cloud", "product": "Identity Platform and Firebase Authentication", "platforms": ["iOS"], "versions": [{"status": "affected", "version": "0", "lessThan": "2026-08-14", "versionType": "date"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "A 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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>A 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.</p>"}]}], "references": [{"url": "https://firebase.google.com/support/releases#auth-helper-fix"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "LOW", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "AMBER", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "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"}}], "solutions": [{"lang": "en", "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.", "supportingMedia": [{"type": "text/html", "base64": false, "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 <a href=\"https://firebase.google.com/docs/auth/web/redirect-best-practices#self-host-helper-code\">Firebase redirect best practices documentation</a>. These users should re-synchronize the helper code to make sure they are hosting the latest version."}]}], "credits": [{"lang": "en", "value": "Mathias Karlsson", "type": "reporter"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}}}

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{"created": "2026-10-30T12:00:15.722782+00:00", "updated": "2026-10-30T12:00:15.722796+00:00", "vendors": []}