OpenStack Neutron Shared Net Port Spoofing via Project Manager RBAC (28.0.1)
CVE-2026-50266 Published on June 4, 2026
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).
Vulnerability Analysis
CVE-2026-50266 is exploitable with network access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-50266. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-50266 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-50266
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Affected Versions
OpenStack Neutron:- Version 25.0.0 and below 25.2.4 is affected.
- Version 26.0.0 and below 26.0.4 is affected.
- Version 27.0.0 and below 27.0.3 is affected.
- Version 28.0.0 and below 28.0.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.