Cross-Site WebSocket Hijacking in Google Cloud Shell

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85267
StatePUBLISHED
AssignerGoogleCloud
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 10:17:07 UTC
Updated2026-10-20 19:18:51 UTC
DescriptionA Cross-Site WebSocket Hijacking vulnerability in Cloud Shell prior to 2026-07-22 on Google Cloud Platform allows an unauthenticated attacker to hijack an active Cloud Shell session and exfiltrate the user's OAuth access token using a cross-origin WebSocket request. This vulnerability was patched on 22 July 2026, and no customer action is needed.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from f45cbf4e-4146-4068-b7e1-655ffc2c548c

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:Clear

EPSS: 0.002210000 probability, percentile 0.119230000 (date 2026-10-20)

Problem Types: CWE-1385 | CWE-1385 CWE-1385 Missing Origin Validation in WebSockets

VersionSourceTypeScoreSeverityVector
4.0f45cbf4e-4146-4068-b7e1-655ffc2c548cSecondary8.7HIGHCVSS: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/C...
4.0CNACVSS8.7HIGHCVSS: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:Clear

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
Low

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:Clear

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Google Cloud Cloud Shell affected 2026-07-22 date Not specified

References

ReferenceSourceLinkTags
docs.cloud.google.com/shell/docs/release-notes f45cbf4e-4146-4068-b7e1-655ffc2c548c docs.cloud.google.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Elad Beber (en)

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