# CVE-2026-81102: Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation

> CVE-2026-81102: Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation. CVSS 3.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-81102
Last updated: 2026-09-24T20:43:32Z

- Published: 2026-08-27 14:50 UTC · Updated: 2026-09-24 20:43 UTC · Assigner: VulnCheck
- CVSS: 3.1 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- EPSS: 0.18%, 8th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-346

## 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.

## Affected vendors and products

- dropbox: mcp-server-dash

## Tracked companies

- [Dropbox](https://rewindex.com/company/dropbox.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-81102)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-81102)
- [https://github.com/dropbox/mcp-server-dash](https://github.com/dropbox/mcp-server-dash)
- [https://github.com/dropbox/mcp-server-dash/pull/12](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](https://www.vulncheck.com/advisories/dropbox-dash-mcp-server-dns-rebinding-via-missing-host-header-validation)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-81102 · Markdown: https://rewindex.com/cve/CVE-2026-81102.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-81102 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:28.225Z