{"id":"EUVD-2026-37881","revision":"0250ec28fa534888be3d8ad92d800dcc","records":[{"revision":"0250ec28fa534888be3d8ad92d800dcc","observedAt":"2026-10-30T02:00:32.217+00:00","statement":{"source":"euvd","id":"EUVD-2026-37881","aliases":["CVE-2026-11719","GHSA-5gf6-gc35-xjpc"],"title":"An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers.","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).","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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,"severity":null}],"references":["https://github.com/googleapis/mcp-toolbox/pull/3335","https://github.com/googleapis/mcp-toolbox/pull/3049"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-37881","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 18, 2026, 11:55:03 AM","dateUpdated":"Jun 18, 2026, 1:53:08 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-37881","identifiers":["EUVD-2026-37881","CVE-2026-11719","GHSA-5gf6-gc35-xjpc"]},"retained":false,"historicalAffected":[]}],"coverage":[]}