CVE-2026-14538BigQuery Dataset Allowlist Bypass via Metadata Dry-Run in MCP Toolbox
Updated under an hour ago ()
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It affects Google mcp-toolbox and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.7 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U
- Weakness (CWE)
- CWE-285, CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- NVD analysis
- Analyzed
- Record last updated
- Jul 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Google mcp-toolbox google:mcp_toolbox (from the name) | from 0.16.1 through 1.4.0 | CNA record |
google mcp_toolbox_for_databases google:mcp_toolbox_for_databases | from 0.16.1 through 1.4.0 | NVD |
References
- https://github.com/googleapis/mcp-toolbox/pull/3452issue-tracking, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.