CVE-2026-11719 (GCVE-0-2026-11719)
Vulnerability from cvelistv5 – Published: 2026-06-18 11:55 – Updated: 2026-06-18 13:53
VLAI
EPSS
VEX
Summary
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).
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 12:55 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
Google
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MCP Toolbox for Databases (googleapis/mcp-toolbox) |
Affected:
1.3.0
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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