CVE Watch31 jul 2026

CVE-2026-14538

An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of Google mcp-toolbox versio

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

0-100

Publicado: 31 jul 2026 · Última mod.: 31 jul 2026 · CWE-285 · CWE-863

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of Google mcp-toolbox versions 0.16.1 through 1.4.0 allows an authenticated attacker to bypass allowedDatasets validation checks. The toolbox relies on the BigQuery dry-run API to enforce dataset restrictions, but due to a fail-open logic flaw, it bypasses validation when the API returns an empty array for specialized constructs. This allows the attacker to extract structural DDL schemas for explicitly excluded datasets via INFORMATION_SCHEMA, and access downstream federated row data via EXTERNAL_QUERY connections.

Referencias oficiales

github.comhttps://github.com/googleapis/mcp-toolbox/pull/3452

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