What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-31 · updated 2026-09-08
• Weakness: CWE-863

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.

Affected products

• samanhappy mcphub: before 1.0.31

References

• 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

Get alerted when CVE-2026-79746 or the next vulnerability affects your stack