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THREAT OPS › Threat News › [NVD] CVE-2026-14541 (HIGH 7.5) — 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 defined audience or clientId, the ValidateMCPAut

[NVD] CVE-2026-14541 (HIGH 7.5) — 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 defined audience or clientId, the ValidateMCPAut

mednvdPublished 2026-07-31

CVE-2026-14541 CVSS: 7.5 HIGH Published: 2026-07-31T03:16:24.170

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 defined audience or clientId, the ValidateMCPAuth pipeline for opaque tokens skips audience validation

Indicators of compromise

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-14541