Xibo: Missing Object-Level Authorization on /notification/export/{id} Allows Authenticated Users to Download Arbitrary Attachments

{
  "id": "3ed7d63bab71fb0152251234a05d6ade57ab83edf5f0aabe39c8ae364f5e7644",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-50539",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Xibo: Missing Object-Level Authorization on /notification/export/{id} Allows Authenticated Users to Download Arbitrary Attachments",
    "summary": "Xibo is an open source digital signage platform with a web content management system and Windows display player software. Prior to 4.4.3, missing object-level authorization on `/notification/export/{id}` allows an authenticated user to download attachments from any notification, including notifications created by administrators, by iterating over `sequential notification IDs`. Exploitation requires access to the `Notification Centre` to view past notifications, a privilege granted to non-administrators as standard. This issue is fixed in version 4.4.3.",
    "evidence": "cve:CVE-2026-50539",
    "products": [
      {
        "name": {
          "value": "xibo-cms",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-50539",
      "aliases": [
        "CVE-2026-50539"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 6.5,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "NONE",
            "privilegesRequired": "LOW",
            "confidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "xibosignage",
          "product": "xibo-cms",
          "versions": [
            {
              "status": "affected",
              "version": "< 4.4.3"
            }
          ]
        }
      ],
      "modified": "2026-10-28T16:06:48.627Z",
      "provider": "cve",
      "references": [
        "https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-p4pg-v57g-7jf6",
        "https://github.com/xibosignage/xibo-cms/pull/3487",
        "https://github.com/xibosignage/xibo-cms/commit/13ed6e6bf3c15a93089b4fd2148379888ee82d74",
        "https://github.com/xibosignage/xibo-cms/commit/1dcc3f2de6dc7861e7dbb5148e94f14ebb1513b3",
        "https://github.com/xibosignage/xibo-cms/releases/tag/4.4.3",
        "https://github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-50539",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-28T16:01:06.316667Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-28T16:06:48.627Z"
            }
          }
        ],
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-28T15:31:12.074Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-50539",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 460278,
  "published_at": "2026-10-28T15:31:12.074+00:00"
}