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).
History

Thu, 04 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 04 Jun 2026 18:15:00 +0000

Type Values Removed Values Added
Title Unauthorized Network-Scoped Port Creation Enables Spoofing in OpenStack Neutron

Thu, 04 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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).
First Time appeared Openstack
Openstack neutron
Weaknesses CWE-863
CPEs cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
Vendors & Products Openstack
Openstack neutron
References
Metrics cvssV3_1

{'score': 2.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-04T17:28:01.143Z

Reserved: 2026-06-04T16:18:38.592Z

Link: CVE-2026-50266

cve-icon Vulnrichment

Updated: 2026-06-04T17:27:46.791Z

cve-icon NVD

Status : Received

Published: 2026-06-04T17:16:33.517

Modified: 2026-06-04T18:16:32.357

Link: CVE-2026-50266

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-04T18:00:13Z