CVE-2026-85267CWE-1385

CVE-2026-85267

published October 20, 2026

CVSS
8.7
EPSS
0%
Percentile
10.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.7 · NONE
CVSS v4.0
8.7 · 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
EPSS
0.00211 · 10.8th percentile
Weakness
CWE-1385 · Missing Origin Validation in WebSockets
Published
2026-10-20T14:17Z
References (1)
https://docs.cloud.google.com/shell/docs/release-notes#July_28_2026 · f45cbf4e-4146-4068-b7e1-655ffc2c548c
EPSS history
Timeline
  • 21 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 20 OCT 09:16Z
    Cross-Site WebSocket Hijacking in Google Cloud Shell
    cvelistv5
  • 20 OCT 09:16Z
    Cross-Site WebSocket Hijacking in Google Cloud Shell
    cvelistv5