{"id":"GHSA-5gf6-gc35-xjpc","summary":"MCP Toolbox for Databases: authenticated authorization bypass","details":"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).","aliases":["CVE-2026-11719","GO-2026-5144"],"modified":"2026-06-25T18:56:14.176527201Z","published":"2026-06-18T15:32:02Z","database_specific":{"cwe_ids":["CWE-862"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-06-19T17:00:02Z","nvd_published_at":"2026-06-18T14:17:20Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11719"},{"type":"WEB","url":"https://github.com/googleapis/mcp-toolbox/pull/3049"},{"type":"WEB","url":"https://github.com/googleapis/mcp-toolbox/pull/3335"},{"type":"PACKAGE","url":"https://github.com/googleapis/mcp-toolbox"}],"affected":[{"package":{"name":"github.com/googleapis/mcp-toolbox","ecosystem":"Go","purl":"pkg:golang/github.com/googleapis/mcp-toolbox"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.4.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-5gf6-gc35-xjpc/GHSA-5gf6-gc35-xjpc.json"}}],"schema_version":"1.9.0","severity":[{"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"}]}