8.6
High
CVE-2026-11719 An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement…
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).
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| MCP Toolbox for Databases (googleapis/mcp-toolbox) | 1.3.0 | No fix stated |
References
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
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