Security advisory

{
  "id": "86fe5f68ec9cefea04be8d6d2a2b24c3a526b801e34b5dd200d9223a752caa10",
  "url": "https://osv.dev/vulnerability/CVE-2026-93856",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-93856",
    "summary": "In OpenStack Cinder through 29.0.0, cross-project information disclosure can occur in the Messages API. A non-admin user with the project-scoped 'member' or 'reader' role making the Block Storage API v3.3 \"List messages\" call finds the non-expired user messages for other projects included in the response, resulting in the leakage of UUIDs of resources owned by other projects, in addition to the user message about the other projects' resources (which, by design, are sanitized generic messages). All Cinder deployments are affected.",
    "evidence": "osv:CVE-2026-93856",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-93856",
      "aliases": [
        "CVE-2026-93856"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://opendev.org/openstack/cinder",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c36f40684e140a1492b00dd4812e8dce17fb2ebf"
                },
                {
                  "last_affected": "e4a83e9391c7441bfcd6f551d905fd1f0bcb418a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "27.0.0"
                      },
                      {
                        "last_affected": "27.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "28.0.0"
                      },
                      {
                        "last_affected": "28.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "29.0.0"
                      },
                      {
                        "last_affected": "29.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "27.0.0",
            "28.0.0",
            "29.0.0",
            "29.0.0.0rc2",
            "29.0.0.0rc1",
            "28.0.0.0rc1",
            "27.0.0.0rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93856.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.367071068Z",
      "provider": "osv",
      "references": [
        "https://bugs.launchpad.net/cinder/+bug/2160671",
        "https://opendev.org/openstack/cinder",
        "https://security.openstack.org/ossa/OSSA-2026-045.html",
        "https://www.openwall.com/lists/oss-security/2026/10/20/17",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93856.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93856"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-669"
        ],
        "cna_assigner": "mitre",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0.0"
                  },
                  {
                    "fixed": "26.3.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93856.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93856",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497356,
  "published_at": "2026-10-21T05:36:39.501+00:00"
}