Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Google / MCP Toolbox for Databases (googleapis/mcp-toolbox) | affected 1.3.0 |
CWE
CWE-862
References
- https://github.com/googleapis/mcp-toolbox/pull/3335
- https://github.com/googleapis/mcp-toolbox/pull/3049
ADP enrichment
No English description supplied.
No references supplied.