{"id":"CVE-2026-50266","aliases":["DEBIAN-CVE-2026-50266","EUVD-2026-34301","GHSA-qmc5-gv6v-8p22","PYSEC-2026-3491","UBUNTU-CVE-2026-50266"],"status":"published","title":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","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).","severity":{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00262,"percentile":0.18229,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-863"],"published":"2026-06-04T16:18:39Z","modified":"2026-10-28T02:30:46Z","fixes":[{"ecosystem":"PyPI","package":"neutron","fixed_in":["28.0.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:13","package":"neutron","fixed_in":["2:26.0.3-0+deb13u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"neutron","fixed_in":["2:28.0.0-7"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"28.0.1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:26.0.3-0+deb13u2"}]}],"versions":["2:26.0.0-9","2:26.0.0-9+deb13u1"]},{"source":"osv","ecosystem":"Debian:14","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:28.0.0-7"}]}],"versions":["2:26.0.0-9","2:27.0.0-1","2:27.0.0~rc1-1","2:27.0.0~rc1-2","2:27.0.1-1","2:27.0.1-2","2:27.0.1-3","2:27.0.1-4","2:27.0.1-5","2:27.0.1-6","2:28.0.0-1","2:28.0.0-2","2:28.0.0-3","2:28.0.0-4","2:28.0.0-5","2:28.0.0-6","2:28.0.0~rc1-1","2:28.0.0~rc1-2","2:28.0.0~rc2-1","2:28.0.0~rc2-2"]},{"source":"osv","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"28.0.1"}]}],"versions":["0.0","10.0.5","10.0.6","10.0.7","11.0.3","11.0.4","11.0.5","11.0.6","11.0.7","11.0.8","12.0.0","12.0.0.0b3","12.0.0.0rc1","12.0.0.0rc2","12.0.1","12.0.2","12.0.3","12.0.4","12.0.5","12.0.6","12.1.0","12.1.1","13.0.0","13.0.0.0b1","13.0.0.0b2","13.0.0.0b3","13.0.0.0rc1","13.0.0.0rc2","13.0.1","13.0.2","13.0.3","13.0.4","13.0.5","13.0.6","13.0.7","14.0.0","14.0.0.0b1","14.0.0.0b2","14.0.0.0b3","14.0.0.0rc1","14.0.1","14.0.2","14.0.3","14.0.4","14.1.0","14.2.0","14.3.0","14.3.1","14.4.0","14.4.1","14.4.2","15.0.0","15.0.0.0b1","15.0.0.0rc1","15.0.0.0rc2","15.0.1","15.0.2","15.1.0","15.2.0","15.3.0","15.3.1","15.3.2","15.3.3","15.3.4","16.0.0","16.0.0.0b1","16.0.0.0rc1","16.0.0.0rc2","16.1.0","16.2.0","16.3.0","16.3.1","16.3.2","16.4.0","16.4.1","16.4.2","17.0.0","17.0.0.0rc1","17.0.0.0rc2","17.1.0","17.1.1","17.1.2","17.2.0","17.2.1","17.3.0","17.4.0","17.4.1","18.0.0","18.0.0.0rc1","18.0.0.0rc2","18.1.0","18.1.1","18.2.0","18.3.0","18.4.0","18.5.0","18.6.0","19.0.0","19.0.0.0rc1","19.0.0.0rc2","19.1.0","19.2.0","19.3.0","19.4.0","19.5.0","19.6.0","19.7.0","20.0.0","20.0.0.0rc1","20.0.0.0rc2","20.1.0","20.2.0","20.3.0","20.3.1","20.4.0","20.5.0","21.0.0","21.0.0.0rc1","21.0.0.0rc2","21.1.0","21.1.1","21.1.2","21.2.0","21.2.1","22.0.0","22.0.0.0rc1","22.0.0.0rc2","22.0.1","22.0.2","22.1.0","22.2.0","22.2.1","23.0.0","23.0.0.0b1","23.0.0.0b2","23.0.0.0b3","23.0.0.0rc1","23.0.0.0rc2","23.1.0","23.2.0","23.3.0","23.4.0","23.5.0","24.0.0","24.0.0.0b1","24.0.0.0rc1","24.0.0.0rc2","24.0.1","24.1.0","24.2.0","24.2.1","24.2.2","25.0.0","25.0.0.0b1","25.0.0.0rc1","25.0.0.0rc2","25.1.0","25.2.0","25.2.1","25.2.2","25.2.3","26.0.0","26.0.0.0b1","26.0.0.0b2","26.0.0.0rc1","26.0.0.0rc2","26.0.1","26.0.2","26.0.3","26.0.4","26.0.5","27.0.0","27.0.0.0b1","27.0.0.0rc1","27.0.1","27.0.2","27.0.3","28.0.0","28.0.0.0b1","28.0.0.0b2","28.0.0.0rc1","28.0.0.0rc2"]},{"source":"osv","ecosystem":"PyPI","package":"neutron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"28.0.1"}]}],"versions":["0.0","10.0.5","10.0.6","10.0.7","11.0.3","11.0.4","11.0.5","11.0.6","11.0.7","11.0.8","12.0.0","12.0.0.0b3","12.0.0.0rc1","12.0.0.0rc2","12.0.1","12.0.2","12.0.3","12.0.4","12.0.5","12.0.6","12.1.0","12.1.1","13.0.0","13.0.0.0b1","13.0.0.0b2","13.0.0.0b3","13.0.0.0rc1","13.0.0.0rc2","13.0.1","13.0.2","13.0.3","13.0.4","13.0.5","13.0.6","13.0.7","14.0.0","14.0.0.0b1","14.0.0.0b2","14.0.0.0b3","14.0.0.0rc1","14.0.1","14.0.2","14.0.3","14.0.4","14.1.0","14.2.0","14.3.0","14.3.1","14.4.0","14.4.1","14.4.2","15.0.0","15.0.0.0b1","15.0.0.0rc1","15.0.0.0rc2","15.0.1","15.0.2","15.1.0","15.2.0","15.3.0","15.3.1","15.3.2","15.3.3","15.3.4","16.0.0","16.0.0.0b1","16.0.0.0rc1","16.0.0.0rc2","16.1.0","16.2.0","16.3.0","16.3.1","16.3.2","16.4.0","16.4.1","16.4.2","17.0.0","17.0.0.0rc1","17.0.0.0rc2","17.1.0","17.1.1","17.1.2","17.2.0","17.2.1","17.3.0","17.4.0","17.4.1","18.0.0","18.0.0.0rc1","18.0.0.0rc2","18.1.0","18.1.1","18.2.0","18.3.0","18.4.0","18.5.0","18.6.0","19.0.0","19.0.0.0rc1","19.0.0.0rc2","19.1.0","19.2.0","19.3.0","19.4.0","19.5.0","19.6.0","19.7.0","20.0.0","20.0.0.0rc1","20.0.0.0rc2","20.1.0","20.2.0","20.3.0","20.3.1","20.4.0","20.5.0","21.0.0","21.0.0.0rc1","21.0.0.0rc2","21.1.0","21.1.1","21.1.2","21.2.0","21.2.1","22.0.0","22.0.0.0rc1","22.0.0.0rc2","22.0.1","22.0.2","22.1.0","22.2.0","22.2.1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://launchpad.net/bugs/2152115","tags":["issue-tracking","report","web"]},{"url":"https://review.opendev.org/990273","tags":["patch","fix","web"]},{"url":"https://review.opendev.org/990353","tags":["patch","fix","web"]},{"url":"https://review.opendev.org/990356","tags":["patch","fix","web"]},{"url":"https://www.openwall.com/lists/oss-security/2026/06/04/6","tags":["web","report"]},{"url":"https://bugs.launchpad.net/neutron/+bug/2152115","tags":["exploit","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50266","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qmc5-gv6v-8p22","tags":["advisory"]},{"url":"https://opendev.org/openstack/neutron","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50266.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-50266","tags":["advisory"]},{"url":"https://github.com/openstack/neutron","tags":["package"]},{"url":"https://pypi.org/project/neutron","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-50266","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-50266","tags":["report"]},{"url":"https://security.openstack.org/ossa/OSSA-2026-021.html","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-50266","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).","status":"published","published":"2026-06-04T16:18:39.167Z","modified":"2026-06-04T17:28:01.143Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:20:09.098623Z"}],"euvd":[{"id":"EUVD-2026-34301","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).","status":"published","published":"2026-06-04T16:18:39Z","modified":"2026-06-04T17:28:01Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T18:20:52.744481Z"}],"ghsa":[{"id":"GHSA-qmc5-gv6v-8p22","title":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","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).","status":"published","published":"2026-06-04T18:30:32Z","modified":"2026-07-15T22:40:06Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:40:44.915484Z"}],"nvd":[{"id":"CVE-2026-50266","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).","status":"published","published":"2026-06-04T17:16:33.517Z","modified":"2026-07-22T20:10:00.127Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:22.022466Z"}],"osv":[{"id":"CVE-2026-50266","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).","status":"published","published":"2026-06-04T16:18:39.167Z","modified":"2026-10-28T02:30:46.573294803Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:45:07.431113Z"},{"id":"DEBIAN-CVE-2026-50266","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).","status":"published","published":"2026-06-04T17:16:33.517Z","modified":"2026-10-01T03:03:16.594314617Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:45:56.877408Z"},{"id":"GHSA-qmc5-gv6v-8p22","title":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","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).","status":"published","published":"2026-06-04T18:30:32Z","modified":"2026-09-10T03:50:50.294499216Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:46:54.760124Z"},{"id":"PYSEC-2026-3491","title":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","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).","status":"published","published":"2026-07-23T11:41:38.956068Z","modified":"2026-07-23T15:00:16.621074451Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:52:56.847083Z"},{"id":"UBUNTU-CVE-2026-50266","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).","status":"published","published":"2026-06-04T17:16:00Z","modified":"2026-10-28T01:07:37.41790926Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T16:56:33.391918Z"}]}}