8.3 High

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

Description

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.

CVSS 4.0 detail

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

Exploitable remotely over the network, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: Low
Interaction: None
Confidentiality: High
Integrity: None
Availability: None
Confidentiality of other systems: High
Integrity of other systems: None
Availability of other systems: None

Affected products and versions

Product	Affected versions	Fixed in
Compute Engine 2026	earliest → < 2026-08-31	2026-08-31

References

docs.cloud.google.com docs.cloud.google.com

Timeline

Published October 27, 2026
Last modified November 4, 2026

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