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

Quick assessment

Affected
Google Cloud Identity Platform and Firebase Authentication
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Cloud Identity Platform 和 Firebase Authentication 在 2026-08-14 之前的版本中，其 iOS 平台的 组件存在跨站脚本（XSS）漏洞（CWE-79）。该漏洞允许未认证的远程攻击者利用恶意的 iOS 应用包标识符（bundle ID）执行任意 JavaScript 代码。

CVSS 8.7 · High
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I. Basic Information for CVE-2026-85268

Vulnerability Information
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Vulnerability Title
Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google Cloud Identity Platform and Firebase Authentication 0 ~ 2026-08-14 -

II. Public POCs for CVE-2026-85268

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III. Intelligence Information for CVE-2026-85268

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Other References for CVE-2026-85268 (1)

IV. Related Vulnerabilities

Same vendor: Google Cloud
Same weakness: CWE-79