--- title: "CVE-2026-85268: Google Cloud Identity Platform & Firebase Authentication - Stored XSS" description: "Google Cloud Identity Platform and Firebase Authentication < 2026-08-14 on iOS contain a stored XSS caused by improper sanitization of iOS bundle ID in auth/handler, letting unauthenticated remote attackers execute arbitrary JavaScript." url: https://panop.io/threat-heartbeat/CVE-2026-85268/ --- # CVE-2026-85268 Google Cloud Identity Platform & Firebase Authentication - Stored XSS Google Cloud Identity Platform and Firebase Authentication < 2026-08-14 on iOS contain a stored XSS caused by improper sanitization of iOS bundle ID in auth/handler, letting unauthenticated remote attackers execute arbitrary JavaScript. CVSS base score 8.7 /10 High CISA KEV Not listed Public exploit None known Authentication Not required EPSS 0.58% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-85268) ## Details Type Stored XSS Impact Client Script Exec CVSS vector 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber Published 30 October 2026 Updated 1 November 2026 Weakness [CWE-79](https://cwe.mitre.org/data/definitions/79.html) ## Vendor fix Update to version 2026-08-14 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-85268](https://nvd.nist.gov/vuln/detail/CVE-2026-85268) - [https://firebase.google.com/support/releases#auth-helper-fix](https://firebase.google.com/support/releases#auth-helper-fix) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)