samanhappy MCPHub up to 1.0.30 Bearer Key isBearerKeyAllowedForRequest improper authorization

Summaryinfo

A vulnerability classified as critical was found in samanhappy MCPHub up to 1.0.30. The impacted element is the function isBearerKeyAllowedForRequest of the component Bearer Key. The manipulation results in improper authorization. This vulnerability is cataloged as CVE-2026-79746. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in samanhappy MCPHub up to 1.0.30. Affected is the function isBearerKeyAllowedForRequest of the component Bearer Key. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-79746 since 08/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 1.0.31 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• samanhappy

Name

• MCPHub

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19
• 1.0.20
• 1.0.21
• 1.0.22
• 1.0.23
• 1.0.24
• 1.0.25
• 1.0.26
• 1.0.27
• 1.0.28
• 1.0.29
• 1.0.30

Website

• Product: https://github.com/samanhappy/mcphub/

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Once again VulDB remains the best source for vulnerability data.

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