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CVE-2026-14538

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

Published: Jul 31, 2026Updated: Aug 8, 2026 Sources: CVE List NVDCWE-285
7.7HIGH
NVD MITRE
EPSS Score
0.2%
Top 91.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-285CWE-863

Affected Products

Google
commercial·USaka google inc, google llc
mcp toolbox for databasesOn-premDatabase
Databases / db-tooling
mcp-toolboxOn-prem
Mobile Apps / android-app

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

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

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