{"id":"CVE-2026-50266","aliases":["GHSA-qmc5-gv6v-8p22","PYSEC-2026-3491"],"title":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","summary":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","severity":"low","cvss":2.2,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","vendor":"neutron","product":"neutron","ecosystem":"pip","affected":["neutron < 28.0.1"],"patched":["neutron 28.0.1"],"published":"2026-06-04","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:50.294499216Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-qmc5-gv6v-8p22","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50266"},{"url":"https://bugs.launchpad.net/neutron/+bug/2152115"},{"url":"https://github.com/openstack/neutron"},{"url":"https://launchpad.net/bugs/2152115"},{"url":"https://review.opendev.org/990273"},{"url":"https://review.opendev.org/990353"},{"url":"https://review.opendev.org/990356"},{"url":"https://www.openwall.com/lists/oss-security/2026/06/04/6"}],"tags":["osv","pip"],"epss":0.00262,"epssPercentile":0.1838,"ingestedAt":"2026-07-16T18:59:41.664Z","slug":"CVE-2026-50266","body":"## Overview\n\nIn 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).\n\n## Affected packages\n\n- `neutron < 28.0.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `neutron 28.0.1`","depth":"sunlit","depthScore":12,"depthScoreParts":{"impact":12.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}