{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "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"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "96a445dee8363976333aed121358a4b86f9428e0"
            },
            {
              "fixed": "68346f102f34be9345e8e590b68622101a9c4922"
            },
            {
              "introduced": "46f4ef447537d80bff2bb64da6a61fff40e8fcc3"
            },
            {
              "fixed": "6e846c1a2d5ad40f767e87b6c8ddb14b509ba5d7"
            },
            {
              "introduced": "eb9dd526a3c4ba0ffbb69d06cc387c86ca755d42"
            },
            {
              "fixed": "8d11b5e2fd0f72840fc827ffe4ab4f3fa89221d0"
            }
          ],
          "repo": "https://opendev.org/openstack/neutron",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "mitre",
    "cwe_ids": [
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50266.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "25.0.0"
          },
          {
            "fixed": "25.2.4"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "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).",
  "id": "CVE-2026-50266",
  "modified": "2026-07-08T05:36:51.524926487Z",
  "published": "2026-06-04T16:18:39.167Z",
  "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"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}