{"id":"CVE-2026-50266","state":"PUBLISHED","title":"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:\" a","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).","publishedAt":"2026-06-04T16:18:39.167Z","updatedAt":"2026-06-04T17:28:01.143Z","severity":{"score":2.2,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","source":"mitre"},"assigner":"mitre","products":["OpenStack Neutron"],"affected":[{"vendor":"OpenStack","product":"Neutron","defaultStatus":"unaffected","versions":[{"version":"25.0.0","status":"affected","lessThan":"25.2.4","versionType":"semver"},{"version":"26.0.0","status":"affected","lessThan":"26.0.4","versionType":"semver"},{"version":"27.0.0","status":"affected","lessThan":"27.0.3","versionType":"semver"},{"version":"28.0.0","status":"affected","lessThan":"28.0.1","versionType":"semver"}],"repo":"https://opendev.org/openstack/neutron"}],"references":["https://launchpad.net/bugs/2152115","https://review.opendev.org/990273","https://review.opendev.org/990353","https://review.opendev.org/990356","https://www.openwall.com/lists/oss-security/2026/06/04/6","https://bugs.launchpad.net/neutron/+bug/2152115"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/50xxx/CVE-2026-50266.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-50266","state":"PUBLISHED","datePublished":"2026-06-04T16:18:39.167Z","dateUpdated":"2026-06-04T17:28:01.143Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2026-06-04T16:18:38.592Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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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