CVE-2026-11717

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "MCP Toolbox for Databases (googleapis/mcp-toolbox)", "vendor": "Google", "versions": [{"lessThanOrEqual": "1.3.0", "status": "affected", "version": "1.0.0", "versionType": "semver"}]}], "source": "cve-coordination@google.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:google:mcp_toolbox_for_databases:*:*:*:*:*:*:*:*", "matchCriteriaId": "4533DCB3-1308-442B-8E0B-F3814E8F4DA4", "versionEndIncluding": "1.3.0", "versionStartIncluding": "1.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n existe en la ruta gen\u00e9rica de validaci\u00f3n de tokens opacos (validateOpaqueToken) de googleapis/mcp-toolbox.\n\nAl verificar un token opaco no analizado a trav\u00e9s de un endpoint de introspecci\u00f3n de OAuth 2.0 (RFC 7662), la caja de herramientas decodifica la respuesta en una estructura introspectResp donde el campo Active se declara como un puntero a un booleano (bool). El c\u00f3digo solo rechaza expl\u00edcitamente un token si la respuesta contiene un campo activo poblado establecido en falso (if introspectResp.Active != nil && !introspectResp.Active). Si un endpoint de introspecci\u00f3n responde con una carga \u00fatil que omite completamente la clave activa obligatoria, la variable interna permanece nil, lo que provoca que la verificaci\u00f3n condicional se cortocircuite. Como resultado, Toolbox acepta tokens de autorizaci\u00f3n a los que les falta el campo \u2019active\u2019, otorgando acceso a herramientas protegidas y fuentes de datos subyacentes."}], "id": "CVE-2026-11717", "lastModified": "2026-10-26T11:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cve-coordination@google.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11717", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-18T12:23:05.330652Z", "version": "2.0.3"}}]}, "published": "2026-06-18T14:17:20.013", "references": [{"source": "cve-coordination@google.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/googleapis/mcp-toolbox/pull/3341"}], "sourceIdentifier": "cve-coordination@google.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "cve-coordination@google.com", "type": "Secondary"}]}

{}

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