PYSEC-2026-4206

Vulnerability from pysec - Published: 2026-10-15 10:22 - Updated: 2026-10-15 14:37
VLAI
Details

DeepTutor before version 1.4.10 contains an authorization bypass vulnerability that allows low-privilege users to invoke unrestricted MCP tools due to the allowed_mcp_tools function returning None instead of a denied result when mcp_tools is omitted from a user's grant in deeptutor/multi_user/tool_access.py. Attackers or prompt-injected content acting within a user session can enumerate and invoke any configured MCP tool, including filesystem, shell, and browser servers, gaining unauthorized access to sensitive deployment resources.

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Impacted products
Name purl
deeptutor pkg:pypi/deeptutor
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "deeptutor",
        "purl": "pkg:pypi/deeptutor"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0",
        "1.4.0b0",
        "1.4.1",
        "1.4.2",
        "1.4.3",
        "1.4.4",
        "1.4.5",
        "1.4.6",
        "1.4.7",
        "1.4.8",
        "1.4.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58168",
    "GHSA-jg88-rvpc-qvxj"
  ],
  "details": "DeepTutor before version 1.4.10 contains an authorization bypass vulnerability that allows low-privilege users to invoke unrestricted MCP tools due to the allowed_mcp_tools function returning None instead of a denied result when mcp_tools is omitted from a user\u0027s grant in deeptutor/multi_user/tool_access.py. Attackers or prompt-injected content acting within a user session can enumerate and invoke any configured MCP tool, including filesystem, shell, and browser servers, gaining unauthorized access to sensitive deployment resources.",
  "id": "PYSEC-2026-4206",
  "modified": "2026-10-15T14:37:38.070543Z",
  "published": "2026-10-15T10:22:43.280997Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58168"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HKUDS/DeepTutor/pull/579"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HKUDS/DeepTutor/commit/90046374b3dcd4f8a866d2d64a64440bc08eb2ef"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/HKUDS/DeepTutor"
    },
    {
      "type": "WEB",
      "url": "https://github.com/HKUDS/DeepTutor/releases/tag/v1.4.10"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/deeptutor-insecure-default-grants-unrestricted-mcp-tool-access-to-non-admin-users"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/deeptutor"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jg88-rvpc-qvxj"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "DeepTutor missing MCP tool authorization allows non-admin users to invoke unrestricted tools"
}



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