How severe is CVE-2026-11719?

CVE-2026-11719 has a CVSS 4.0 base score of 8.6, rated high severity.

Is CVE-2026-11719 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

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 2026-06-22.

CVE-2026-11719

CVE-2026-11719 is a high-severity vulnerability with a CVSS 4.0 base score of 8.6. 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 4.0 base score 8.6)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37881
Weakness: CWE-862
Published: 2026-06-18
Last modified: 2026-06-22

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 4.0 base score of 8.6, rated high severity.
Is CVE-2026-11719 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
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 2026-06-22.

References

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