{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-53903",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T13:42:26.696418Z",
                "version": "2.0.3"
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              "type": "ssvc"
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          "dateUpdated": "2026-07-01T13:42:31.836Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
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      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "MCO",
          "vendor": "MyComplianceOffice",
          "versions": [
            {
              "status": "affected",
              "version": "25.3.3.1",
              "versionType": "custom"
            }
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        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Hubert Decyusz (AFINE Team)"
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          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "MCO is vulnerable to an Insecure Direct Object Reference (IDOR) vulnerability in the \u003ci\u003e/customer/servlet/mco/webapi/trading-document/fetchPdfStatement\u003c/i\u003e endpoint. The application does not properly validate whether an authenticated user is authorized to access a requested document, allowing direct retrieval based on a user-supplied identifier.\u003cbr\u003eAn attacker can access trading documents belonging to other users by providing a valid document ID. Although exploitation requires guessing the identifier, predictable ID patterns enable feasible enumeration, leading to unauthorized disclosure of sensitive information.\u003cbr\u003e\u003cbr\u003eBecause vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1\u0026nbsp;but may also affect other versions."
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        }
      ],
      "metrics": [
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            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
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        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639 Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T11:58:36.922Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2026/07/CVE-2026-53902"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://mco.mycomplianceoffice.com/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Insecure Direct Object Reference in MCO",
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    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-53903",
    "datePublished": "2026-07-01T11:58:36.922Z",
    "dateReserved": "2026-06-11T07:44:52.179Z",
    "dateUpdated": "2026-07-01T13:42:31.836Z",
    "state": "PUBLISHED"
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