CVE-2026-85267 PUBLISHED

Cross-Site WebSocket Hijacking in Google Cloud Shell

Assigner: GoogleCloud
Reserved: 03.09.2026 Published: 20.10.2026 Updated: 20.10.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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/U:Clear
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	Low
Attack Complexity	Low	Integrity	High	Integrity	Low
Attack Requirements	None	Availability	High	Availability	Low
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Google Cloud
Product	Cloud Shell
Versions	Default: unaffected affected from 0 to 2026-07-22 (excl.)

Credits

Elad Beber reporter

References

https://docs.cloud.google.com/shell/docs/release-notes#July_28_2026

Problem Types

CWE-1385 Missing Origin Validation in WebSockets CWE

Impacts

CAPEC-62 Cross Site Request Forgery
CAPEC-593 Session Hijacking