CVE-2026-14541: An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of

Routine

HIGH 7.5REMOTEDOWNGRADE

CVE-2026-14541 is a high-severity flaw (CVSS 7.5) affecting mcp toolbox for databases. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined audience or clientId, the ValidateMCPAuth pipeline for opaque tokens skips audience validation entirely. As a result, the toolbox will accept any valid Google OAuth access token—even those minted for unrelated

Why this priority

High severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 84%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-07-31
Last modified	2026-10-23

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

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-31 03:16 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

google mcp toolbox for databases DOWNGRADE

Affected: 1.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.4.0 (Debian / Ubuntu)

apt-cache madison mcp-toolbox-for-databases sudo apt install mcp-toolbox-for-databases=<VERSION_BEFORE_1.4.0> sudo apt-mark hold mcp-toolbox-for-databases

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mcp-toolbox-for-databases sudo dnf downgrade mcp-toolbox-for-databases-<VERSION_BEFORE_1.4.0> 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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

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.

Quick answers

How do I fix CVE-2026-14541?

mcp toolbox for databases: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-14541 being exploited?

CVE-2026-14541 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-14541 affect?

CVE-2026-14541 affects mcp toolbox for databases. Severity is high (CVSS 7.5). An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined

How urgent is CVE-2026-14541?

Priority 38/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

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References

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