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Vulnerability record · CVE-2026-79746 · published 31 August 2026

CVE-2026-79746: Incorrect authorization vulnerability

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.

8.1 CVSS 3.1 High EPSS 0.43% · top 65.6% CWE-863 · Incorrect authorization Awaiting Analysis
8.1CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
8 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-79746), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.