CVE-2026-14538 BigQuery Dataset Allowlist Bypass via Metadata Dry-Run in MCP Toolbox

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 enfor...

PT-2026-66664

Name of the Vulnerable Software and Affected Versions Google mcp-toolbox versions 0.16.1 through 1.4.0 Description An improper authorization and security-boundary bypass exists in the bigquery-execute-sql tool component. The system uses the BigQuery dry-run API to enforce dataset restrictions;...