CVE-2026-85267
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Cross-Site WebSocket Hijacking in Google Cloud Shell

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: GoogleCloud

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.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-08
NVD
CVE-2026-85267
EUVD
EUVD-2026-104858

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Google Cloud Cloud Shell 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1385 The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.

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Executive Summary

This is a Cross-Site WebSocket Hijacking (CSWSH) vulnerability in Google Cloud Platform's Cloud Shell before July 22, 2026. It allows an unauthenticated attacker to hijack an active Cloud Shell session and steal the user's OAuth access token by exploiting a cross-origin WebSocket request.

Detection Guidance

Detection involves monitoring WebSocket connections for improper Origin header validation. Check Cloud Shell logs for unauthorized WebSocket upgrade requests or OAuth token exfiltration attempts. Use network monitoring tools to inspect WebSocket traffic for unexpected cross-origin requests.

Impact Analysis

An attacker could gain access to your Cloud Shell session and exfiltrate your OAuth access token, potentially allowing them to impersonate you or access your cloud resources without authorization.

Compliance Impact

This vulnerability could potentially expose OAuth access tokens, which may lead to unauthorized access to user data. If exploited, it might result in data breaches that could violate GDPR or HIPAA compliance requirements depending on the data accessed.

Mitigation Strategies

No immediate action is required as the vulnerability was patched on 2026-07-22 and no customer action was needed for the fix.

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