{"id":"CVE-2026-14541","title":"An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0","summary":"An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defin…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-287"],"vendor":"google","product":"mcp_toolbox_for_databases","affected":["mcp_toolbox_for_databases = 1.4.0"],"published":"2026-07-31","updated":"2026-08-08","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-14541","references":[{"url":"https://github.com/googleapis/mcp-toolbox/pull/3450","label":"cve-coordination@google.com"}],"tags":["nvd"],"epss":0.00234,"epssPercentile":0.14515,"ingestedAt":"2026-08-08T14:22:57.238Z","slug":"CVE-2026-14541","body":"## Overview\n\nAn authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined audience or clientId, the ValidateMCPAuth pipeline for opaque tokens skips audience validation entirely. As a result, the toolbox will accept any valid Google OAuth access token—even those minted for unrelated ecosystem applications—granting unauthorized clients access to protected tools and data backends.\n\n## Affected\n\n- `mcp_toolbox_for_databases = 1.4.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}