{"cve":"CVE-2026-11719","nvd":{"published":"2026-06-18T14:17:20.357","modified":"2026-10-26T11:10:00.157","status":"Analyzed","description":"An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers.\n\nWhile 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).","cvss_v4":{"vector":"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","score":8.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-862"],"references":["https://github.com/googleapis/mcp-toolbox/pull/3049","https://github.com/googleapis/mcp-toolbox/pull/3335"],"products":["google:mcp_toolbox_for_databases"],"source":"nvd","synced_at":"2026-10-26T11:33:08.859761529+00:00"},"epss":{"cve":"CVE-2026-11719","score":0.00145,"percentile":0.03737,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-5gf6-gc35-xjpc","url":"https://osv.dev/vulnerability/GHSA-5gf6-gc35-xjpc","summary":"MCP Toolbox for Databases: authenticated authorization bypass","modified":"2026-06-25T18:56:14.176527201Z","packages":[{"ecosystem":"Go","name":"github.com/googleapis/mcp-toolbox","purl":"pkg:golang/github.com/googleapis/mcp-toolbox","ranges":["<1.4.0"],"fixed":["1.4.0"]}]},{"id":"GO-2026-5144","url":"https://osv.dev/vulnerability/GO-2026-5144","summary":"MCP Toolbox for Databases: authenticated authorization bypass in github.com/googleapis/mcp-toolbox","modified":"2026-06-25T18:45:25.286174755Z","packages":[{"ecosystem":"Go","name":"github.com/googleapis/mcp-toolbox","purl":"pkg:golang/github.com/googleapis/mcp-toolbox","ranges":["<1.4.0"],"fixed":["1.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}