{"id":"CVE-2026-79746","state":"PUBLISHED","title":"MCPHub: Server-scoped bearer key gains access to an entire group via partial (any-overlap) server matching","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.","publishedAt":"2026-08-31T17:55:43.528Z","updatedAt":"2026-09-01T14:59:30.891Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["samanhappy mcphub"],"affected":[{"vendor":"samanhappy","product":"mcphub","versions":[{"version":"< 1.0.31","status":"affected"}]}],"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"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/79xxx/CVE-2026-79746.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-79746","state":"PUBLISHED","datePublished":"2026-08-31T17:55:43.528Z","dateUpdated":"2026-09-01T14:59:30.891Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-25T14:08:18.108Z"},"containers":{"cna":{"title":"MCPHub: Server-scoped bearer key gains access to an entire group via partial (any-overlap) server matching","descriptions":[{"lang":"en","value":"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":[{"vendor":"samanhappy","product":"mcphub","versions":[{"version":"< 1.0.31","status":"affected"}]}],"references":[{"url":"https://github.com/samanhappy/mcphub/security/advisories/GHSA-454m-4vm6-842f","name":"https://github.com/samanhappy/mcphub/security/advisories/GHSA-454m-4vm6-842f","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/samanhappy/mcphub/pull/1059","name":"https://github.com/samanhappy/mcphub/pull/1059","tags":["x_refsource_MISC"]},{"url":"https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552","name":"https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552","tags":["x_refsource_MISC"]},{"url":"https://github.com/samanhappy/mcphub/releases/tag/v1.0.31","name":"https://github.com/samanhappy/mcphub/releases/tag/v1.0.31","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-31T17:55:43.528Z"},"source":{"advisory":"GHSA-454m-4vm6-842f","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-01T14:16:53.516019Z","id":"CVE-2026-79746","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-01T14:59:30.891Z"}}]}}}