CVE-2026-50266
lowpriority · track · 0OT risk · elevatedEPSS 0.003 · 18 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (5)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-qmc5-gv6v-8p22OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks2026-06-04ghsa · osvUS
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).
- PYSEC-2026-3491OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks2026-07-23vendor · osvUS
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).
also known as (6)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (17)
External citations — patches, advisories, analysis.
- https://bugs.launchpad.net/neutron/+bug/2152115cnnvd
- https://launchpad.net/bugs/2152115cnnvd
- https://review.opendev.org/990273cnnvd
- https://review.opendev.org/990353cnnvd
- https://review.opendev.org/990356cnnvd
- https://www.openwall.com/lists/oss-security/2026/06/04/6cnnvd
- https://launchpad.net/bugs/2152115enisa_euvd
- https://review.opendev.org/990273enisa_euvd
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