CVE-2026-79746: CWE-863: Incorrect Authorization 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 1.0.31, when a bearer key with accessType: 'servers' (or 'custom') is used against a group route, isBearerKeyAllowedForRequest grants access to the entire group as long as any single server in that group appears in the key's allowedServers list — not only when every server the key is scoped to matches, and critically, without ever re-checking allowedServers again once the group-level connection is authorized. A key explicitly scoped to one specific server therefore also grants full access to every other server that happens to share a group with it, including servers the key was never authorized for. This issue has been patched in version 1.0.31.
CVSS v3.1
Score 8.1high
Affected software
samanhappy
mcphub
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MCPHub versions before 1.0.31 contain an authorization flaw where the function isBearerKeyAllowedForRequest incorrectly grants access to an entire group of servers if the bearer key's allowedServers list includes any one server in that group. The check does not verify that the key is authorized for every server in the group, leading to excessive access permissions. This allows a key scoped to a single server to gain unauthorized access to other servers sharing the same group. The issue is fixed in version 1.0.31.
Potential Impact
An attacker with a bearer key scoped to a specific server can gain unauthorized access to all servers within the same group, potentially exposing sensitive data or functionality on servers they are not authorized to access. The vulnerability impacts confidentiality and integrity but does not affect availability. The CVSS 3.1 score is 8.1 (high severity), reflecting network attack vector, low attack complexity, low privileges required, no user interaction, and high impact on confidentiality and integrity.
Mitigation Recommendations
Upgrade to mcphub version 1.0.31 or later, where this authorization issue has been patched. No other mitigation or temporary workaround is indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-25T14:08:18.108Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a95c2eeacd9273b496c0dd9
Added to database: 08/31/2026, 18:07:42 UTC
Last enriched: 09/07/2026, 14:48:40 UTC
Last updated: 10/14/2026, 18:48:24 UTC
Views: 108
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