{"id":"CVE-2026-81102","state":"PUBLISHED","title":"Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation","description":"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.","publishedAt":"2026-08-27T14:50:41.263Z","updatedAt":"2026-08-29T11:48:14.917Z","severity":{"score":2.3,"label":"Low","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["dropbox mcp-server-dash"],"affected":[{"vendor":"dropbox","product":"mcp-server-dash","defaultStatus":"unaffected","versions":[{"version":"84567b74e3c72e42d5e50ee07c56864613f519c2","status":"unaffected","versionType":"git"},{"version":"0","status":"affected","lessThan":"84567b74e3c72e42d5e50ee07c56864613f519c2","versionType":"git"}],"collectionURL":"https://github.com/dropbox/mcp-server-dash","repo":"https://github.com/dropbox/mcp-server-dash"}],"references":["https://github.com/dropbox/mcp-server-dash","https://github.com/dropbox/mcp-server-dash/pull/12","https://www.vulncheck.com/advisories/dropbox-dash-mcp-server-dns-rebinding-via-missing-host-header-validation"],"weaknesses":["CWE-346"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/81xxx/CVE-2026-81102.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-81102","state":"PUBLISHED","datePublished":"2026-08-27T14:50:41.263Z","dateUpdated":"2026-08-29T11:48:14.917Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-26T16:00:34.461Z"},"containers":{"cna":{"title":"Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation","descriptions":[{"lang":"en","value":"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. 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