Is CVE-2026-79746 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-79746 being exploited in the wild.

How severe is CVE-2026-79746?

High severity, with a CVSS score of 8.1, published 31 August 2026.

Which products and versions are affected?

Samanhappy Mcphub prior to 1.0.31.

Is there a fix for CVE-2026-79746?

A patch was published on 2026-08-21: Patched in version 1.0.31 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-79746 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-79746?

Check whether you run Samanhappy Mcphub at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-79746: MCPHub bearer key privilege escalation on group routes

CVE-2026-79746 · Severity: high · CVSS 8.1 · Published 2026-08-31

MCPHub is a hub for managing and routing requests to multiple model context protocol (MCP) servers. A flaw in bearer token validation allows an API key scoped to access a single server to also access all other servers sharing the same group route, even if the key was never authorized for those servers. An attacker with a scoped API key can thereby bypass access controls and reach MCP servers they should not have permission to access.

Technologies: Samanhappy Mcphub. Vendors: Samanhappy.

Quick answers

Is CVE-2026-79746 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-79746 being exploited in the wild.
How severe is CVE-2026-79746?: High severity, with a CVSS score of 8.1, published 31 August 2026.
Which products and versions are affected?: Samanhappy Mcphub prior to 1.0.31.
Is there a fix for CVE-2026-79746?: A patch was published on 2026-08-21: Patched in version 1.0.31 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-79746 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-79746?: Check whether you run Samanhappy Mcphub at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is an authorization bypass (CWE-863) in the `isBearerKeyAllowedForRequest` function in `src/services/sseService.ts`. When a bearer key with `accessType: 'servers'` or `'custom'` is used against a group route, the function incorrectly grants group-level access if any single server in that group matches the key's `allowedServers` list, using an "any-overlap" check (`Array.some`) instead of requiring full containment. Furthermore, once group-level access is granted, the `allowedServers` list is never re-checked downstream, allowing unrestricted access to all servers in the group. A bearer key scoped to one server therefore gains full access to every other server in the same group. The fix changes the authorization logic to require that every server in a group be in the key's `allowedServers` list (`Array.every`), and explicitly rejects empty groups. The patch was released in version 1.0.31.

Affected products

samanhappy MCPHub prior to 1.0.31

Timeline

2026-08-31: disclosed: Published to NVD
2026-08-21: patched: Patched in version 1.0.31

References

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