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 ↗

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

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

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