blazar — security advisory

{
  "id": "75dd39d526a3dd120bee134ea41d0c37654696660257070f57bc715cf5903b85",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93854",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-93854",
    "summary": "In OpenStack Blazar before 17.0.1, the V2 lease API does not enforce object-level authorization on its update and delete operations (PUT /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id}). The policy authorize() wrapper attempts to load the target lease to build the authorization target from its owner, but it looks up the lease under the keyword \"lease_id\" whereas the controller methods name the parameter \"id\" (and the wsme_pecan.wsexpose wrapper delivers it positionally). The lookup returns None, and thus authorization falls back to the requesting user's own project_id/user_id instead of the target lease owner. Any authenticated user who knows a lease ID can therefore modify or delete leases belonging to other users and projects, bypassing the intended ownership check.",
    "evidence": "osv:UBUNTU-CVE-2026-93854",
    "products": [
      {
        "name": {
          "value": "blazar",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "17.0.0-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "blazar",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "15.0.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "16.0.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "17.0.0-2",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-93854",
      "aliases": [
        "UBUNTU-CVE-2026-93854"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "blazar",
            "purl": "pkg:deb/ubuntu/blazar?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "17.0.0-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93854.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "blazar-api",
                "binary_version": "17.0.0-2"
              },
              {
                "binary_name": "blazar-common",
                "binary_version": "17.0.0-2"
              },
              {
                "binary_name": "blazar-manager",
                "binary_version": "17.0.0-2"
              },
              {
                "binary_name": "python3-blazar",
                "binary_version": "17.0.0-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "blazar",
            "purl": "pkg:deb/ubuntu/blazar?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "15.0.0-3",
            "16.0.0-1",
            "17.0.0-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93854.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "blazar-api",
                "binary_version": "17.0.0-2"
              },
              {
                "binary_name": "blazar-common",
                "binary_version": "17.0.0-2"
              },
              {
                "binary_name": "blazar-manager",
                "binary_version": "17.0.0-2"
              },
              {
                "binary_name": "python3-blazar",
                "binary_version": "17.0.0-2"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:18.603609977Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-93854"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-93854",
        "https://www.cve.org/CVERecord?id=CVE-2026-93854",
        "https://launchpad.net/bugs/2162719"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-93854",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361601,
  "published_at": "2026-09-18T19:17:00+00:00"
}