---
id: CVE-2026-50266
aliases:
  - GHSA-qmc5-gv6v-8p22
  - PYSEC-2026-3491
title: >-
  OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to
  set trusted device owners on shared networks
summary: >-
  OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to
  set trusted device owners on shared networks
severity: low
cvss: 2.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N'
vendor: neutron
product: neutron
ecosystem: pip
affected:
  - neutron < 28.0.1
patched:
  - neutron 28.0.1
published: '2026-06-04'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:50.294499216Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-qmc5-gv6v-8p22'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50266'
  - url: 'https://bugs.launchpad.net/neutron/+bug/2152115'
  - url: 'https://github.com/openstack/neutron'
  - url: 'https://launchpad.net/bugs/2152115'
  - url: 'https://review.opendev.org/990273'
  - url: 'https://review.opendev.org/990353'
  - url: 'https://review.opendev.org/990356'
  - url: 'https://www.openwall.com/lists/oss-security/2026/06/04/6'
tags:
  - osv
  - pip
epss: 0.00377
epssPercentile: 0.2895
ingestedAt: '2026-07-16T18:59:41.664Z'
---

## Overview

In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has "network:" at the beginning ("network:dhcp" for example). The default port RBAC policies incorrectly included PROJECT_MANAGER without requiring network ownership, allowing any project manager to obtain trusted network-service port behavior on shared networks. Depending on backend and deployment, this can bypass anti-spoofing and security group protections, enabling DHCP, MAC, or IP spoofing against other tenants on the shared network. This is a regression of CVE-2015-5240 (OSSA-2015-018).

## Affected packages

- `neutron < 28.0.1`

## Remediation

Upgrade to a patched release:

- `neutron 28.0.1`