{"cve":"CVE-2026-50266","nvd":{"published":"2026-06-04T17:16:33.517","modified":"2026-07-22T20:10:00.127","status":"Awaiting Analysis","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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N","score":2.2},"cwes":["CWE-863"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:37:48.043517290+00:00"},"epss":{"cve":"CVE-2026-50266","score":0.00262,"percentile":0.18096,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-qmc5-gv6v-8p22","url":"https://osv.dev/vulnerability/GHSA-qmc5-gv6v-8p22","summary":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","modified":"2026-09-10T03:50:50.294499216Z","packages":[{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["<28.0.1"],"fixed":["28.0.1"]}]},{"id":"PYSEC-2026-3491","url":"https://osv.dev/vulnerability/PYSEC-2026-3491","summary":"OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks","modified":"2026-07-23T15:00:16.621074451Z","packages":[{"ecosystem":"PyPI","name":"neutron","purl":"pkg:pypi/neutron","ranges":["<28.0.1"],"fixed":["28.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}