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CVE-2026-50266

Quick assessment

Affected
OpenStack Neutron
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenStack Neutron是OpenStack开源的一个 OpenStack 项目，旨在为其他 OpenStack 服务管理的接口设备之间提供服务。 OpenStack Neutron 28.0.1之前版本存在安全漏洞，该漏洞源于项目管理员可以在其他项目拥有的共享网络上创建或更新端口，并将device_owner设置为以network:开头的值，默认端口RBAC策略错误地包含PROJECT_MANAGER而不要求网络所有权，可能导致任何项目管理员在共享网络上获得受信任的网络服务端口行为，从而绕过反

CVSS 2.2 · Low EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 4

VendorProduct Version RangeStatus
OpenStack Neutron 25.0.0< 25.2.4 affected
26.0.0< 26.0.4 affected
27.0.0< 27.0.3 affected
28.0.0< 28.0.1 affected
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I. Basic Information for CVE-2026-50266

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OpenStack Neutron 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenStack Neutron是OpenStack开源的一个 OpenStack 项目，旨在为其他 OpenStack 服务管理的接口设备之间提供服务。 OpenStack Neutron 28.0.1之前版本存在安全漏洞，该漏洞源于项目管理员可以在其他项目拥有的共享网络上创建或更新端口，并将device_owner设置为以network:开头的值，默认端口RBAC策略错误地包含PROJECT_MANAGER而不要求网络所有权，可能导致任何项目管理员在共享网络上获得受信任的网络服务端口行为，从而绕过反
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenStack Neutron 25.0.0 ~ 25.2.4 -

II. Public POCs for CVE-2026-50266

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III. Intelligence Information for CVE-2026-50266

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Patches & Fixes for CVE-2026-50266 (2)

Mailing List Discussions for CVE-2026-50266 (1)

Other References for CVE-2026-50266 (1)

Same Patch Batch · OpenStack · 2026-06-04 · 5 CVEs total

CVE-2026-41283 9.9 CRITICAL OpenStack Mistral-Dashboard 安全漏洞
CVE-2026-48681 5.9 MEDIUM OpenStack Ironic 安全漏洞
CVE-2026-50589 5.3 MEDIUM OpenStack Ironic 安全漏洞
CVE-2026-44917 4.9 MEDIUM OpenStack Ironic 安全漏洞

IV. Related Vulnerabilities

Same product: Neutron
Same vendor: OpenStack
Same weakness: CWE-863

V. Comments for CVE-2026-50266

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