CVE-2026-14538: An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool componen

Routine

HIGH 7.7UPGRADE

CVE-2026-14538 is a high-severity flaw (CVSS 7.7) affecting mcp toolbox for databases. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 a

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-285, CWE-863
Published	2026-07-31
Last modified	2026-10-23

Publisher (CNA): Google Inc. · Vendor: google

Am I affected?

Timeline

2026-07-31 02:16 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

google mcp toolbox for databases UPGRADE

Affected: >= 0.16.1 and <= 1.4.0

Fixed in: newer than 1.4.0

Safe to downgrade to: a release before 0.16.1

1. Check installed version

apt-cache policy mcp-toolbox-for-databases || rpm -q mcp-toolbox-for-databases || mcp-toolbox-for-databases --version

2. UPGRADE to newer than 1.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mcp-toolbox-for-databases

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mcp-toolbox-for-databases

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.16.1 (Debian / Ubuntu)

apt-cache madison mcp-toolbox-for-databases sudo apt install mcp-toolbox-for-databases=<VERSION_BEFORE_0.16.1> sudo apt-mark hold mcp-toolbox-for-databases

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mcp-toolbox-for-databases sudo dnf downgrade mcp-toolbox-for-databases-<VERSION_BEFORE_0.16.1> sudo dnf versionlock add mcp-toolbox-for-databases

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

CVE-2026-14537 CRITICAL 9.8 DOWNGRADE Incorrect Authorization in the direct HTTP API tool invocation endpoint in Google mcp-toolbox versions v1.3.0
CVE-2026-14539 HIGH 7.5 UPGRADE An allocation of resources without limits vulnerability in the HTTP handler component of Google mcp-toolbox ve
CVE-2026-14541 HIGH 7.5 DOWNGRADE An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of
CVE-2026-14540 MEDIUM 6.1 UPGRADE A Server-Side Request Forgery (SSRF) vulnerability exists in the generic HTTP source and tool components of Go

References

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