Security advisory

{
  "id": "4caec28df175d3edcf2adeaaad98cfd833c89e1fbfc98856e526931fb51dc2f5",
  "url": "https://osv.dev/vulnerability/CVE-2026-11719",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-11719",
    "summary": "An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers. While the 2025-11-25 protocol version handler correctly enforces per-tool restrictions defined by scopesRequired, older supported protocol versions (2025-06-18, 2025-03-26, and 2024-11-05) omit this check. An authenticated client with low-privilege tokens (e.g., read) can bypass the intended per-tool scope restrictions and execute high-privilege tools (e.g., admin) simply by specifying an older protocol version in the MCP-Protocol-Version header, or by omitting the header entirely (which causes the server to default to the vulnerable 2024-11-05 handler).",
    "evidence": "osv:CVE-2026-11719",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-11719",
      "aliases": [
        "CVE-2026-11719",
        "GHSA-5gf6-gc35-xjpc",
        "GO-2026-5144"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/googleapis/mcp-toolbox",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b0010060a939455d91e4f8ba62dc3e72b1892469"
                },
                {
                  "last_affected": "b0010060a939455d91e4f8ba62dc3e72b1892469"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "last_affected": "1.3.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "cpe": "cpe:2.3:a:google:mcp_toolbox_for_databases:1.3.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "last_affected": "1.3.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.0",
            "v1.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11719.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.013672612Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11719.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-11719",
        "https://github.com/googleapis/mcp-toolbox/pull/3049",
        "https://github.com/googleapis/mcp-toolbox/pull/3335"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "Google",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11719.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-11719",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519815,
  "published_at": "2026-06-18T11:55:03.666+00:00"
}