{"id":"CVE-2026-50266","details":"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).","modified":"2026-07-08T08:13:41.408294462Z","published":"2026-06-04T16:18:39.167Z","database_specific":{"cna_assigner":"mitre","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"25.0.0"},{"fixed":"25.2.4"}]}],"cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50266.json"},"references":[{"type":"WEB","url":"https://opendev.org/openstack/neutron"},{"type":"WEB","url":"https://www.openwall.com/lists/oss-security/2026/06/04/6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50266.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50266"},{"type":"REPORT","url":"https://launchpad.net/bugs/2152115"},{"type":"FIX","url":"https://review.opendev.org/990273"},{"type":"FIX","url":"https://review.opendev.org/990353"},{"type":"FIX","url":"https://review.opendev.org/990356"},{"type":"EVIDENCE","url":"https://bugs.launchpad.net/neutron/+bug/2152115"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://opendev.org/openstack/neutron","events":[{"introduced":"96a445dee8363976333aed121358a4b86f9428e0"},{"fixed":"68346f102f34be9345e8e590b68622101a9c4922"},{"introduced":"46f4ef447537d80bff2bb64da6a61fff40e8fcc3"},{"fixed":"6e846c1a2d5ad40f767e87b6c8ddb14b509ba5d7"},{"introduced":"eb9dd526a3c4ba0ffbb69d06cc387c86ca755d42"},{"fixed":"8d11b5e2fd0f72840fc827ffe4ab4f3fa89221d0"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"26.0.0"},{"fixed":"26.0.4"},{"introduced":"27.0.0"},{"fixed":"27.0.3"},{"introduced":"28.0.0"},{"fixed":"28.0.1"}]}}],"versions":["26.0.3","27.0.2","28.0.0.0rc2","28.0.0","26.0.2","27.0.1","27.0.0.0rc1","27.0.0","26.0.1","26.0.0.0rc2","26.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50266.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N"}]}