MantisBT: Stored XSS in File Download

{
  "id": "317b5139d69012fe40923e142a4b2eafb188c74904217c62e088ff88a10f889e",
  "url": "https://osv.dev/vulnerability/CVE-2026-44657",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MantisBT: Stored XSS in File Download",
    "summary": "Mantis Bug Tracker (MantisBT) is an open source issue tracker. Prior to 2.28.2, using show_inline=1 parameter and a valid file_show_inline_token CSRF token on file_download.php, an attacker can execute code by uploading a crafted XHTML attachment referencing a JavaScript attachment. This vulnerability is fixed in 2.28.2.",
    "evidence": "osv:CVE-2026-44657",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44657",
      "aliases": [
        "CVE-2026-44657",
        "GHSA-p6fr-rxq7-xcg8"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mantisbt/mantisbt",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "399605af5f5c7640a2cf6b551409d9e37c5b4b7b"
                },
                {
                  "fixed": "26647b2e68ba30b9d7987d4e03d7a16416684bc2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.28.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "26647b2e68ba30b9d7987d4e03d7a16416684bc2"
                      }
                    ],
                    "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",
            "release-2.22.0",
            "release-2.21.0",
            "release-2.20.0",
            "release-2.19.0",
            "release-2.18.0",
            "release-2.17.0",
            "release-2.16.0",
            "release-2.15.0",
            "release-2.14.0",
            "release-2.13.0",
            "release-2.12.0",
            "release-2.11.0",
            "release-2.10.0",
            "release-2.9.0",
            "release-2.8.0",
            "release-2.7.0",
            "release-2.6.0",
            "release-2.5.0",
            "release-2.4.0",
            "release-2.3.0",
            "release-2.2.0",
            "release-2.1.0",
            "release-2.0.0",
            "release-2.0.0-rc.2",
            "release-2.0.0-rc.1",
            "release-2.0.0-beta.3",
            "release-2.0.0-beta.2",
            "release-2.0.0-beta.1",
            "release-1.3.0-rc.2",
            "release-1.3.0-rc.1",
            "release-1.3.0-beta.3",
            "release-1.3.0-beta.2",
            "release-1.3.0-beta.1",
            "release-1.2.0rc1",
            "release-1.2.0a3",
            "release-1.2.0a2",
            "release-1.2.0a1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44657.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.795998924Z",
      "provider": "osv",
      "references": [
        "https://mantisbt.org/bugs/view.php?id=37020",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44657.json",
        "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3",
        "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-p6fr-rxq7-xcg8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44657",
        "https://github.com/mantisbt/mantisbt/commit/26647b2e68ba30b9d7987d4e03d7a16416684bc2"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44657.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44657",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500978,
  "published_at": "2026-05-28T20:25:26.816+00:00"
}