FKIE_CVE-2026-79746

Vulnerability from fkie_nvd - Published: 2026-08-31 18:17 - Updated: 2026-09-01 15:17
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552
security-advisories@github.comhttps://github.com/samanhappy/mcphub/pull/1059
security-advisories@github.comhttps://github.com/samanhappy/mcphub/releases/tag/v1.0.31
security-advisories@github.comhttps://github.com/samanhappy/mcphub/security/advisories/GHSA-454m-4vm6-842f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mcphub",
          "vendor": "samanhappy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.31"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "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: \u0027servers\u0027 (or \u0027custom\u0027) 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\u0027s allowedServers list \u2014 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."
    }
  ],
  "id": "CVE-2026-79746",
  "lastModified": "2026-09-01T15:17:29.747",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-79746",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-01T14:16:53.516019Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-31T18:17:20.057",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/samanhappy/mcphub/pull/1059"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/samanhappy/mcphub/releases/tag/v1.0.31"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/samanhappy/mcphub/security/advisories/GHSA-454m-4vm6-842f"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.