CVE-2026-50266: CWE-863 Incorrect Authorization in OpenStack Neutron
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).
AI Analysis
Technical Summary
CVE-2026-50266 is an incorrect authorization vulnerability in OpenStack Neutron before version 28.0.1. It allows a project manager to create or update a port on a shared network owned by another project and set the device_owner attribute to a value prefixed with "network:" (e.g., "network:dhcp"). The default RBAC policies incorrectly include the PROJECT_MANAGER role without requiring ownership of the network, enabling any project manager to obtain trusted network-service port behavior on shared networks. Depending on the backend and deployment, this can bypass anti-spoofing and security group protections, allowing DHCP, MAC, or IP spoofing attacks against other tenants on the shared network. This vulnerability is a regression of CVE-2015-5240 (OSSA-2015-018).
Potential Impact
The vulnerability allows project managers to bypass network ownership restrictions on shared networks, potentially enabling spoofing attacks such as DHCP, MAC, or IP spoofing against other tenants. This can undermine network isolation and security group protections. However, the CVSS score of 2.2 and the low severity rating indicate that the impact is limited and requires high privileges (project manager) and specific conditions to exploit.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a patch is available, review and tighten RBAC policies related to project managers and shared network port creation. Monitor OpenStack Neutron vendor advisories for updates and apply official fixes once released.
CVE-2026-50266: CWE-863 Incorrect Authorization in OpenStack Neutron
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).
CVSS v3.1
Score 2.2low
Affected software
OpenStack
Neutron
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-50266 is an incorrect authorization vulnerability in OpenStack Neutron before version 28.0.1. It allows a project manager to create or update a port on a shared network owned by another project and set the device_owner attribute to a value prefixed with "network:" (e.g., "network:dhcp"). The default RBAC policies incorrectly include the PROJECT_MANAGER role without requiring ownership of the network, enabling any project manager to obtain trusted network-service port behavior on shared networks. Depending on the backend and deployment, this can bypass anti-spoofing and security group protections, allowing DHCP, MAC, or IP spoofing attacks against other tenants on the shared network. This vulnerability is a regression of CVE-2015-5240 (OSSA-2015-018).
Potential Impact
The vulnerability allows project managers to bypass network ownership restrictions on shared networks, potentially enabling spoofing attacks such as DHCP, MAC, or IP spoofing against other tenants. This can undermine network isolation and security group protections. However, the CVSS score of 2.2 and the low severity rating indicate that the impact is limited and requires high privileges (project manager) and specific conditions to exploit.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a patch is available, review and tighten RBAC policies related to project managers and shared network port creation. Monitor OpenStack Neutron vendor advisories for updates and apply official fixes once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-04T16:18:38.592Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a21ac6de29bf47b50b8bc30
Added to database: 06/04/2026, 16:48:45 UTC
Last enriched: 07/16/2026, 10:49:50 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 105
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