---
id: CVE-2026-93858
title: >-
  In OpenStack Mistral through 23.0.0, the std.ssh_proxied action passes a
  caller-supplied proxy_command value directly to paramiko.ProxyCommand() before
  any SSH connection to a gateway or target host is attempted
summary: >-
  In OpenStack Mistral through 23.0.0, the std.ssh_proxied action passes a
  caller-supplied proxy_command value directly to paramiko.ProxyCommand() before
  any SSH connection to a gateway or target host is attempted. An authenticated
  project…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N'
cwe:
  - CWE-78
vendor: OpenStack
product: Mistral
affected:
  - Mistral < 20.1.1
  - Mistral >= 21.0.0 < 21.0.1
  - Mistral >= 22.0.0 < 22.0.1
  - Mistral 23.0.0
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:10:41.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93858'
references:
  - url: 'https://launchpad.net/bugs/2162100'
    label: cve@mitre.org
  - url: 'https://security.openstack.org/ossa/OSSA-2026-044.html'
    label: cve@mitre.org
  - url: 'https://launchpad.net/bugs/2162100'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-08T17:56:18.408754Z'
cvssSource: cna
ingestedAt: '2026-10-08T17:56:11.737Z'
---

## Overview

In OpenStack Mistral through 23.0.0, the std.ssh_proxied action passes a caller-supplied proxy_command value directly to paramiko.ProxyCommand() before any SSH connection to a gateway or target host is attempted. An authenticated project member can use the standard action-execution API to submit an arbitrary local command as proxy_command; paramiko starts that command as a subprocess on the executor host under the executor's own service account, independent of whether the SSH connection itself ever succeeds. Only Mistral deployments that permit the std.ssh_proxied action, the default configuration, are affected.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.