CVE-2026-11719
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).
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/googleapis/mcp-toolboxGo | < 1.4.0 | 1.4.0 |
Affected products
3- cpe:2.3:a:google:mcp_toolbox_for_databases:1.3.0:*:*:*:*:*:*:*
- osv-coordsRange: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
4- github.com/googleapis/mcp-toolbox/pull/3049nvdPatchWEB
- github.com/googleapis/mcp-toolbox/pull/3335nvdPatchWEB
- github.com/advisories/GHSA-5gf6-gc35-xjpcghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-11719ghsaADVISORY
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