{"id":"CVE-2026-11719","aliases":["GHSA-5gf6-gc35-xjpc","GO-2026-5144"],"url":"https://o3.security/vulnerability/CVE-2026-11719","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).","published":"2026-06-18T11:55:03.666Z","modified":"2026-08-12T03:51:11.628756649Z","cvss":null,"epss":{"score":0.0015,"percentile":0.04719,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/googleapis/mcp-toolbox","fixedVersion":"1.4.0"}],"fix":{"url":"https://github.com/googleapis/mcp-toolbox/pull/3049","label":"googleapis/mcp-toolbox#3049"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11719.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11719"},{"type":"FIX","url":"https://github.com/googleapis/mcp-toolbox/pull/3049"},{"type":"FIX","url":"https://github.com/googleapis/mcp-toolbox/pull/3335"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:11.628756649Z"}}