Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation

{
  "id": "c516f1a24bc0be2f5a53b14674391f1b437a8680aca95c913966a49dd05a2608",
  "url": "https://osv.dev/vulnerability/CVE-2026-81102",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation",
    "summary": "The Dash MCP server bound its listener to the loopback address but never checked the host a request named. src/mcp_server_dash.py constructed the server for its network mode with the interface restricted to loopback and no transport-security settings, so a name that had been pointed at the loopback address still reached the listener while carrying the attacker's host name. A page in a visitor's browser could therefore drive the local server and invoke its company-search and file-detail tools under the Dropbox credential the server holds. Only the network mode was reachable this way; the standard input mode was not. The fix supplies transport-security settings that enable host checking and allow only the loopback name and port, rejecting other hosts before a tool runs. The repository publishes no versions, so the affected boundary is the commit preceding the fix.",
    "evidence": "osv:CVE-2026-81102",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-81102",
      "aliases": [
        "CVE-2026-81102"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dropbox/mcp-server-dash",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "84567b74e3c72e42d5e50ee07c56864613f519c2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "84567b74e3c72e42d5e50ee07c56864613f519c2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81102.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.794756700Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81102.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81102",
        "https://www.vulncheck.com/advisories/dropbox-dash-mcp-server-dns-rebinding-via-missing-host-header-validation",
        "https://github.com/dropbox/mcp-server-dash/pull/12",
        "https://github.com/dropbox/mcp-server-dash"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-346"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81102.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-81102",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518451,
  "published_at": "2026-08-27T14:50:41.263+00:00"
}