{"schemaVersion":3,"id":"CVE-2026-50266","aliases":["GHSA-qmc5-gv6v-8p22","PYSEC-2026-3491","UBUNTU-CVE-2026-50266","DEBIAN-CVE-2026-50266"],"status":"published","duplicateOf":null,"title":null,"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. 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