CVE-2026-85267: CWE-1385 Missing Origin Validation in WebSockets in Google Cloud Cloud Shell
Description
A 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.
CVSS v4.0
Score 8.7high
Affected software
Google Cloud
Cloud Shell
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-1385) in Google Cloud Cloud Shell involves missing origin validation in WebSockets, enabling an unauthenticated attacker to perform Cross-Site WebSocket Hijacking. Exploitation allows hijacking of an active Cloud Shell session and theft of the user's OAuth access token through a cross-origin WebSocket request. The issue affects versions prior to the patch date 2026-07-22. The vendor has released a patch and manages remediation server-side for this cloud-hosted service.
Potential Impact
An attacker can hijack an active Cloud Shell session without authentication and exfiltrate the victim's OAuth access token, potentially leading to unauthorized access to Google Cloud resources. The CVSS 4.0 score is 8.7 (high severity), reflecting network attack vector, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
The vulnerability was patched on 22 July 2026 by Google. Since Cloud Shell is a cloud-hosted service, Google manages the remediation server-side. No customer action is required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GoogleCloud
- Date Reserved
- 2026-09-03T16:36:10.612Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Is Cloud Service
- true
Threat ID: 6ad739172cdf04f6561b7994
Added to database: 10/20/2026, 09:49:11 UTC
Last enriched: 10/20/2026, 10:03:15 UTC
Last updated: 10/20/2026, 19:34:20 UTC
Views: 18
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