MantisBT: Private Bugnote Attachment Content Leak via REST API

{
  "id": "0e04daccabaf87add187070483b15d7295b6c4c8f3b1d324013c0e6a0f4ede84",
  "url": "https://osv.dev/vulnerability/CVE-2026-42071",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MantisBT: Private Bugnote Attachment Content Leak via REST API",
    "summary": "Mantis Bug Tracker (MantisBT) is an open source issue tracker. From 2.23.0 to 2.28.1, a missing authorization check in MantisBT's file visibility function allows any authenticated user (REPORTER+) to download attachments on private bugnotes they should not be able to access, via the REST API endpoint GET /api/rest/issues/{id}/files and SOAP API mc_issue_attachment_get endpoint. This vulnerability is fixed in 2.28.2.",
    "evidence": "osv:CVE-2026-42071",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-42071",
      "aliases": [
        "CVE-2026-42071",
        "GHSA-pw5x-2mf9-3xc8"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mantisbt/mantisbt",
              "type": "GIT",
              "events": [
                {
                  "introduced": "262968479e283b89c8a42a8a26ff8db38d1738fd"
                },
                {
                  "fixed": "399605af5f5c7640a2cf6b551409d9e37c5b4b7b"
                },
                {
                  "fixed": "029d9d203d9e4ae96b3e59d552fa7395cc1e5071"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.23.0"
                      },
                      {
                        "fixed": "2.28.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "029d9d203d9e4ae96b3e59d552fa7395cc1e5071"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "release-2.28.1",
            "release-2.28.0",
            "release-2.27.0",
            "release-2.26.0",
            "release-2.25.0",
            "release-2.24.0",
            "release-2.23.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42071.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.221671845Z",
      "provider": "osv",
      "references": [
        "https://mantisbt.org/bugs/view.php?id=27039",
        "https://mantisbt.org/bugs/view.php?id=36985",
        "https://mantisbt.org/bugs/view.php?id=37092",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42071.json",
        "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-pw5x-2mf9-3xc8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42071",
        "https://github.com/mantisbt/mantisbt/commit/029d9d203d9e4ae96b3e59d552fa7395cc1e5071"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42071.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42071",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504266,
  "published_at": "2026-05-28T20:29:20.361+00:00"
}