CVE-2026-79750: CWE-639: Authorization Bypass Through User-Controlled Key in samanhappy mcphub
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.
CVSS v3.1
Score 7.7high
Affected software
samanhappy
mcphub
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MCPHub is a management hub for multiple MCP servers/APIs with flexible routing. Before version 1.0.30, non-admin users were scoped to only their owned servers for list views and config edits, but the tool-execution API did not enforce this restriction. As a result, authenticated non-admin users could execute tools on servers owned by others, enabling cross-tenant compromise. Demonstrated impacts include arbitrary file reads on the host (e.g., /etc/passwd) and server-side request forgery (SSRF). The vulnerability is tracked as CWE-639 (Authorization Bypass Through User-Controlled Key) and has a CVSS 3.1 score of 7.7 (high severity). The issue is fixed in version 1.0.30.
Potential Impact
The vulnerability allows authenticated non-admin users to bypass authorization controls and execute commands on MCP servers owned by other users. This cross-tenant access can lead to disclosure of sensitive files and secrets, as well as SSRF attacks, potentially compromising confidentiality. There is no indication of integrity or availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability has been patched in samanhappy mcphub version 1.0.30. Users should upgrade to version 1.0.30 or later to remediate the issue. No other mitigation guidance is provided or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-25T14:08:18.109Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a95c2eeacd9273b496c0de1
Added to database: 08/31/2026, 18:07:42 UTC
Last enriched: 09/07/2026, 13:54:58 UTC
Last updated: 10/14/2026, 06:48:21 UTC
Views: 95
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