CVE-2026-85268: Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID
High · CVSS 8.7 (CVSS 4.0)EPSS 0.58%, 48th percentilePublished Updated Assigner: GoogleCloud
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.
CWE-79
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Google Cloud: Identity Platform and Firebase Authentication
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- firebase.google.com/support/releases (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)