PT-2026-50661 · Google · Mcp Toolbox For Databases

He Wei（ギカク） · Publicado 2026-06-18 · Atualizado 2026-06-18 · CVE-2026-11719

Mitre

CVSS v4.0

8.6

Alta

Vetor base

AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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).

Correção

Missing Authorization

Enumeração de Fraquezas

CWE-862

Identificadores relacionados

CVE-2026-11719

Produtos afetados

Mcp Toolbox For Databases

Referências · 4

• https://github.com/googleapis/mcp-toolbox/pull/3335 · Nota
• https://github.com/googleapis/mcp-toolbox/pull/3049 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-11719 · Nota de Segurança
• https://twitter.com/ptdbugs/status/2067629310077235322 · Publicação no Twitter