{"id":"CVE-2026-11717","revision":"f7ed2dd38ac043bb9c5140cd7eacbb61","records":[{"revision":"f7ed2dd38ac043bb9c5140cd7eacbb61","observedAt":"2026-10-25T05:17:25.909+00:00","statement":{"source":"nvd","id":"CVE-2026-11717","aliases":[],"title":"An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of googleapis/mcp-toolbox.","description":"An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of googleapis/mcp-toolbox.\n\nWhen verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp struct where the Active field is declared as a pointer to a boolean (*bool). The code only explicitly rejects a token if the response contains a populated active field set to false (if introspectResp.Active != nil && !*introspectResp.Active). If an introspection endpoint responds with a payload that completely omits the mandatory active key, the internal variable remains nil, causing the conditional check to short-circuit. As a result, Toolbox accepts authorization tokens missing the \"active\" field, granting access to protected tools and underlying data sources.","state":0,"publishedAt":"2026-06-18T14:17:20.013+00:00","modifiedAt":"2026-08-17T16:13:01.247+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · cve-coordination@google.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/googleapis/mcp-toolbox/pull/3341"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-11717","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-287"],"productCriteria":["cpe:2.3:a:google:mcp_toolbox_for_databases:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-06-18T14:17:20.013","lastModified":"2026-08-17T16:13:01.247"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-11717","identifiers":["CVE-2026-11717"]},"retained":false,"historicalAffected":[]}],"coverage":[]}