---
id: "CVE-2026-85267"
kind: "vulnerability"
aliases: ["CVE-2026-85267"]
title: "Google Cloud Shell: cross-site WebSocket flaw leaks OAuth tokens from sessions"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["cloud-shell", "google-cloud", "vendor"]
not_affected_if: ["patched-service"]
published_at: "2026-10-20T10:17:07+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-23T22:37:22+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85267", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# Google Cloud Shell: cross-site WebSocket flaw leaks OAuth tokens from sessions

Google Cloud Shell had a cross-site WebSocket hijacking flaw that let an attacker take over an active session. The attacker could exfiltrate the user's OAuth access token through a cross-origin WebSocket request.

_Summary, check and fix written by a model from the sources; labelled as such._

## Fix

Google patched this on 22 July 2026 and says no customer action is needed.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-85267

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_