Vulnerability · Published Aug 31, 2026 · Assigned by GitHub_M
CVE-2026-79750MCPHub authenticated horizontal IDOR: any non-admin user executes tools on other users' MCP servers (cross-tenant file read + SSRF)
High 7.7
In plain English
A high-severity authorization bypass via user-controlled key in mcphub from samanhappy. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Official description
MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 1.0.30, MCPHub scopes non-admin users to servers they own (list views and config edits enforce ownership), but the tool-execution API does not. Any authenticated non-admin user can invoke tools on MCP servers owned by other users — servers they cannot even see in GET /api/servers. Because connected MCP servers carry real capability (filesystem, HTTP fetch, cloud APIs with the owner's keys), this is cross-tenant compromise: demonstrated arbitrary host file read (/etc/passwd, another user's secrets) and SSRF. This issue has been patched in version 1.0.30.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| samanhappy | mcphub | < 1.0.30 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
References
- https://github.com/samanhappy/mcphub/security/advisories/GHSA-wfqf-hqwq-8wvf x_refsource_CONFIRM
- https://github.com/samanhappy/mcphub/releases/tag/v1.0.30 x_refsource_MISC