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Back to active CVEs
High · CVSS 8.7CVE-2026-85268

Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle IDCVE-2026-85268

Answer in brief

CVE-2026-85268 records a High severity (CVSS 8.7) vulnerability in Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID. The current sources do not mark it as known exploited. The current feed maps Google Cloud/Identity Platform and Firebase Authentication (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 30, 2026Updated Oct 30, 2026Source checked Oct 30, 2026First seen by HOL Oct 30, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Google Cloud/Identity Platform and Firebase Authentication (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Google Cloud/Identity Platform and Firebase Authenticationgeneric>=0 <2026-08-142026-08-14

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Google Cloud/Identity Platform and Firebase Authentication.
  2. 2Review the reported fix. Source-reported solution: 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.

Evidence timeline and material changes

  1. Published upstream

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 30, 2026

Sources and claim methodology

  • Source referencefirebase.google.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • WP User Frontend < 4.3.14 - Reflected XSS via 'field_attr' ParameterAlso CWE-79
  • Food Store <= 1.5.5 - Unauthenticated Stored Cross-Site Scripting via 'service_time' CookieAlso CWE-79
  • WP Visitor Statistics (Real Time Traffic) < 8.8 - Unauthenticated Stored XSS via Tracker Device ParametersAlso CWE-79
  • Joinchat 6.3.2 - 6.4.1 - Author+ Stored XSS via Button Block Message AttributeAlso CWE-79
  • Firelight Lightbox < 2.3.23 - Contributor+ Stored XSS via Lightbox Link 'href' AttributeAlso CWE-79
  • Cool FormKit Lite <= 2.7.9 - Authenticated (Contributor+) Stored DOM-Based Cross-Site Scripting via Form Field custom_id ParameterAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 30, 2026
References
1 linked source
Open source record