cti-transmute Conversion History Authorization Bypass Leads to Sensitive Data Disclosure After Conversion Deletion

{
  "id": "8dddad30fbb77a09390b80576435c86839aa53f5d3ccad4ca8deff85493c6f6b",
  "url": "https://osv.dev/vulnerability/CVE-2026-72759",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cti-transmute Conversion History Authorization Bypass Leads to Sensitive Data Disclosure After Conversion Deletion",
    "summary": "In affected versions of MISP cti-transmute, the conversion-history details endpoint performs an incomplete authorization check. When a history record references a deleted conversion, the associated conversion lookup returns None. The previous logic only denied access when the conversion object existed and the visibility check failed. As a result, deleted conversions bypassed the authorization check and their retained history input/output could be disclosed to a user able to request the corresponding history entry. The July 22, 2026 commit changes the logic to deny access whenever the conversion is missing or the requester lacks permission",
    "evidence": "osv:CVE-2026-72759",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-72759",
      "aliases": [
        "CVE-2026-72759"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/cti-transmute",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "88dc65f0117cf7a120f6252674c529e7b9c9b8c3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "88dc65f0117cf7a120f6252674c529e7b9c9b8c3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.4",
            "v1.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72759.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.106373820Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72759.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72759",
        "https://github.com/MISP/cti-transmute/commit/88dc65f0117cf7a120f6252674c529e7b9c9b8c3",
        "https://github.com/MISP/cti-transmute"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "CIRCL",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.4.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72759.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72759",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497224,
  "published_at": "2026-08-10T14:19:13.478+00:00"
}