Vulnerability-Lookup

CVE-2026-85268 (GCVE-0-2026-85268)

Vulnerability from cvelistv5 – Published: 2026-10-30 10:20 – Updated: 2026-10-30 16:48

Title

Cross-Site Scripting (XSS) in Firebase Auth Handler via Malicious Bundle ID

Summary

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.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-30 16:48 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Assigner

GoogleCloud CNA under the Google root

CNA scorecard B 77/100 over 32 records in the last 180 days details

References

1 reference

URL	Tags
https://firebase.google.com/support/releases#auth…

Impacted products

1 product

Vendor	Product	Version	CPE status
Google Cloud	Identity Platform and Firebase Authentication	Affected: 0 , < 2026-08-14 (date)	guessed

Credits

Mathias Karlsson

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-85268

Vulnerability from fkie_nvd - Published: 2026-10-30 11:17 - Updated: 2026-10-30 19:37

Severity

8.7 (High) - 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

Summary

References

	URL	Tags
	f45cbf4e-4146-4068-b7e1-655ffc2c548c	https://firebase.google.com/support/releases#auth-helper-fix

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-VWMJ-J37X-R937

Vulnerability from github – Published: 2026-10-30 12:31 – Updated: 2026-10-30 12:31

Details

Severity

8.7 (High)


                  
                    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

Show details on source website

JSON

To clipboard

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    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-30T11:17:33Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-vwmj-j37x-r937",
  "modified": "2026-10-30T12:31:15Z",
  "published": "2026-10-30T12:31:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85268"
    },
    {
      "type": "WEB",
      "url": "https://firebase.google.com/support/releases#auth-helper-fix"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-85268 (GCVE-0-2026-85268)

FKIE_CVE-2026-85268

GHSA-VWMJ-J37X-R937

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour