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CVE-2026-79746— MCPHub: Server-scoped bearer key gains access to an entire group via partial (any-overlap) server matching

Quick assessment

Affected
samanhappy mcphub
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCPHub 是一个统一中枢，用于集中管理并动态编排多个 MCP 服务器/API，将其路由到独立的端点，并支持灵活的路由策略。在 1.0.31 版本之前，当使用 （或 ）的 Bearer 密钥访问组路由时， 函数只要密钥的 列表中包含该组内的任意一个服务器，就会授予对整个组的访问权限——而不是要求密钥作用域内的所有服务器都匹配，并且关键的是，一旦在组级别连接被授权，便不再重新检查 。因此，一个明确限定于某个特定服务器的密钥，也会意外地获得对该组内其他所有服务器（包括该密钥从未被授权访问的服务器）的完整访问权限。该问

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
samanhappy mcphub < 1.0.31 affected
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I. Basic Information for CVE-2026-79746

Vulnerability Information
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Vulnerability Title
MCPHub: Server-scoped bearer key gains access to an entire group via partial (any-overlap) server matching
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
samanhappy mcphub < 1.0.31 -

II. Public POCs for CVE-2026-79746

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III. Intelligence Information for CVE-2026-79746

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Patches & Fixes for CVE-2026-79746 (2)

Vendor Advisories for CVE-2026-79746 (1)

Vendor Pages for CVE-2026-79746 (1)

Same Patch Batch · samanhappy · 2026-08-31 · 8 CVEs total

CVE-2026-79748 9.9 CRITICAL MCPHub: Authenticated non-admin user achieves RCE via POST /api/servers (missing authoriza
CVE-2026-79744 8.8 HIGH MCPHub: Missing Authorization on `PUT /api/system-config` Lets Any Non-Admin Rewrite Globa
CVE-2026-79750 7.7 HIGH MCPHub authenticated horizontal IDOR: any non-admin user executes tools on other users' MC
CVE-2026-79749 7.6 HIGH MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation
CVE-2026-79745 7.1 HIGH MCPHub: Missing Authorization on Built-in Prompt & Resource CRUD (Unauthorized Tampering o
CVE-2026-79747 7.1 HIGH MCPHub vulnerable to SSRF: a non-admin user can make mcphub request arbitrary URLs and rea
CVE-2026-79743 6.9 MEDIUM MCPHub: Path Traversal via Malicious MCPB Manifest Name

IV. Related Vulnerabilities

Same product: mcphub
Same vendor: samanhappy
Same weakness: CWE-863

V. Comments for CVE-2026-79746

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