CVEvulnerability

CVE-2026-14538

5.7 MEDIUM Published 2026-07-31 Modified 2026-10-23 Official page ↗
Status
Analyzed
Published
2026-07-31
Last modified
2026-10-23
Assigner
[email protected]
CVSS 4.0 ([email protected])
5.7 MEDIUM — 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
7.7 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weaknesses
CWE-285, CWE-863

Description

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.

Affected configurations

• google mcp toolbox for databases (>= 0.16.1 <= 1.4.0)

Related

Weakness · CWE (2)

  • CWE-285 Improper Authorization weakness
  • CWE-863 Incorrect Authorization weakness

References