How severe is CVE-2026-11719?

CVE-2026-11719 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-11719 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-11719?

CVE-2026-11719 affects Google Mcp Toolbox For Databases. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-11719?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-11719 have an EU (EUVD) identifier?

Yes. CVE-2026-11719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37881.

When was CVE-2026-11719 published?

CVE-2026-11719 was published on 2026-06-18 and last updated on 2026-08-17.

CVE-2026-11719

CVE-2026-11719 is a high-severity vulnerability in Google Mcp Toolbox For Databases with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 8.6
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37881
Weakness: CWE-862
Affected product: Google Mcp Toolbox For Databases
Published: 2026-06-18
Last modified: 2026-08-17

Description

An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers. While the 2025-11-25 protocol version handler correctly enforces per-tool restrictions defined by scopesRequired, older supported protocol versions (2025-06-18, 2025-03-26, and 2024-11-05) omit this check. An authenticated client with low-privilege tokens (e.g., read) can bypass the intended per-tool scope restrictions and execute high-privilege tools (e.g., admin) simply by specifying an older protocol version in the MCP-Protocol-Version header, or by omitting the header entirely (which causes the server to default to the vulnerable 2024-11-05 handler).

Frequently asked questions

What is CVE-2026-11719?: An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers. While the 2025-11-25 protocol version handler correctly enforces per-tool restrictions defined by scopesRequired, older supported protocol versions (2025-06-18, 2025-03-26, and 2024-11-05) omit this check. An authenticated client with low-privilege tokens (e.g., read) can bypass the intended per-tool scope restrictions and execute high-privilege tools (e.g., admin) simply by specifying an older protocol version in the MCP-Protocol-Version header, or by omitting the header entirely (which causes the server to default to the vulnerable 2024-11-05 handler).
How severe is CVE-2026-11719?: CVE-2026-11719 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-11719 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-11719?: CVE-2026-11719 affects Google Mcp Toolbox For Databases. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-11719?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-11719 have an EU (EUVD) identifier?: Yes. CVE-2026-11719 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37881.
When was CVE-2026-11719 published?: CVE-2026-11719 was published on 2026-06-18 and last updated on 2026-08-17.

References

Affected products (1)

cpe:2.3:a:google:mcp_toolbox_for_databases:1.3.0:*:*:*:*:*:*:*

More vulnerabilities in Google Mcp Toolbox For Databases

CVE-2026-14537 — Critical (CVSS 9.8): Incorrect Authorization in the direct HTTP API tool invocation endpoint in Google mcp-toolbox versions v1.3.0 and…
CVE-2026-11720 — Critical (CVSS 9.1): A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox. When constructing…
CVE-2026-11718 — Critical (CVSS 9.1): An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of…
CVE-2026-11717 — Critical (CVSS 9.1): An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of…
CVE-2026-14538 — High (CVSS 7.7): An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of…
CVE-2026-14541 — High (CVSS 7.5): An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google…

All CVEs affecting Google Mcp Toolbox For Databases →

Other CWE-862 (Missing Authorization) vulnerabilities

CVE-2026-65667 — Critical (CVSS 10.0): Missing authorization in Microsoft Teams allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-48168 — Critical (CVSS 10.0): PraisonAI is a multi-agent teams system. In versions prior to 4.6.40, the bundled Claude GitHub Actions workflow is…
CVE-2026-66012 — Critical (CVSS 10.0): SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated…
CVE-2026-58275 — Critical (CVSS 10.0): Missing authorization in Azure DNS allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-0092 — Critical (CVSS 10.0): In Package Manager, there is a possible device lock controller bypass due to a missing permission check. This could…
CVE-2026-33712 — Critical (CVSS 10.0): Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the preview chat endpoint (POST…

Browse all CWE-862 (Missing Authorization) vulnerabilities →