IDOR and missing authorization in Prospero Flow CRM supplier API allows cross-tenant read and modification

{
  "id": "9e722ad0b07af54d7b154692d6168326d3f81ceecee65cceb3f6c3ebc7f6c12a",
  "url": "https://osv.dev/vulnerability/CVE-2026-78365",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "IDOR and missing authorization in Prospero Flow CRM supplier API allows cross-tenant read and modification",
    "summary": "Authorization Bypass Through User-Controlled Key in the supplier API in Roskus Prospero Flow CRM 4.0.0 through 5.3.1 allows any authenticated user to read and modify another company's supplier record, and to reassign it to their own company, via a PUT request to /api/supplier/{id} setting company_id in the body.",
    "evidence": "osv:CVE-2026-78365",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-78365",
      "aliases": [
        "CVE-2026-78365"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/roskus/prospero-flow-crm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4a52477e6ed66afa436814c80e7bcd68670dd596"
                },
                {
                  "fixed": "584f315878b8366244c95fe3cb016b3a63f05db8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "4a52477e6ed66afa436814c80e7bcd68670dd596"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "584f315878b8366244c95fe3cb016b3a63f05db8"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.5.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.6.0",
            "v2.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-78365.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.793244472Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78365.json",
        "https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-78365",
        "https://secur0.com/en/cna/cve-list/cve-2026-78365-idor-supplier-api-cross-tenant-update",
        "https://github.com/Roskus/prospero-flow-crm/commit/4a52477e6ed66afa436814c80e7bcd68670dd596",
        "https://github.com/Roskus/prospero-flow-crm"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639",
          "CWE-862"
        ],
        "cna_assigner": "Secur0",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "4.0.0"
                  },
                  {
                    "fixed": "5.3.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "4.0.0"
                  },
                  {
                    "fixed": "5.3.2"
                  }
                ],
                "source": "CPE_FIELD",
                "strategy": "CPEApplicability"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "4.0.0"
                  },
                  {
                    "last_affected": "5.3.1"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78365.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-78365",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505272,
  "published_at": "2026-08-24T12:49:36.802+00:00"
}