EUVD-2026-68684Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
PR:L reflects required authenticated session; S:C captures cross-tenant reach into victim-owned server contexts; I:N and A:N are consistent with demonstrated read-only and SSRF-only impact.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Cross-tenant tool execution in MCPHub before v1.0.30 allows any authenticated non-admin user to invoke tools on MCP servers owned by other tenants, bypassing the ownership enforcement that correctly gates list views and configuration edits. Because each registered MCP server runs with the capabilities and credentials of its owner - filesystem access, cloud API keys, HTTP-fetch tools - an attacker with any valid session can exfiltrate victim-owned secrets (demonstrated: /etc/passwd, user secrets) and trigger SSRF against internal services using the victim server's context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated session for any non-admin MCPHub account - no special role, group membership, or elevated privilege beyond basic login is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.7 with S:C accurately captures the cross-tenant blast radius: a single low-privilege account can reach every other user's connected MCP server on the same instance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade MCPHub to version 1.0.30 immediately; this is the vendor-confirmed patch per the GitHub release at https://github.com/samanhappy/mcphub/releases/tag/v1.0.30 and advisory GHSA-wfqf-hqwq-8wvf, which introduces authorization enforcement on the server layer via group visibility and shared-user controls (PR #1054). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, verify MCPHub version in your environment and audit all non-admin user accounts with active sessions; rotate all stored credentials and secrets in affected MCP servers immediately. …
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Same technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today