CVE-2026-81102
Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validation
- State
- Published
- Severity
- 2.3 Low
- Published
- Aug 27, 2026
- Updated
- Aug 29, 2026
- Reserved
- Aug 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | 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 | VulnCheck |
| 3.1 | 3.1 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-346 Origin Validation Error
Affected Products
| Product | Versions |
|---|---|
mcp-server-dashdropbox |
|
References
- https://github.com/dropbox/mcp-server-dashproduct
- https://github.com/dropbox/mcp-server-dash/pull/12issue-trackingpatch
- VulnCheck Advisory: Dropbox Dash MCP Server DNS Rebinding via Missing Host Header Validationthird-party-advisory
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