# CVE-2026-85299: Missing Authorization in Compute Engine allows Cross-Project Disk Exfiltration

Status: published. Published: 2026-10-27. Updated: 2026-11-04.

A Missing Authorization vulnerability in the disks.createSnapshot and regionDisks.createSnapshot APIs in Google Compute Engine versions prior to 2026-08-31 on Google Cloud Platform allows an authenticated attacker to exfiltrate cross-project disk data.


This vulnerability was patched on 31 August 2026, and no customer action is needed.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Google Cloud / Compute Engine: ≥ 0; < 2026-08-31 (affected, date). Source: CNA: GoogleCloud

## Severity and prioritization

- CVSS 4.0: 8.3 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/U:Clear; source: CNA: GoogleCloud

- CISA KEV: No listing in collected sources

- EPSS: 0.26% as of 2026-11-04; percentile 17.24%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://docs.cloud.google.com/compute/docs/security-bulletins#gcp-2026-073 (CNA: GoogleCloud)

## Provenance

- CNA: GoogleCloud: https://www.cve.org/CVERecord?id=CVE-2026-85299; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-85299; retrieved 2026-11-04; source updated Not reported

Revision: 3d8cf01a3b18a89b6b9e06558b7a0081d3a91e35b5594c0f3c7c45af88cd8c55

Canonical: https://y2.dev/cve/CVE-2026-85299

## Agent and API access

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- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.