CVE-2026-11717 (GCVE-0-2026-11717)

Vulnerability from cvelistv5 – Published: 2026-06-18 11:50 – Updated: 2026-06-18 12:23
VLAI
Summary
An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp struct where the Active field is declared as a pointer to a boolean (*bool). The code only explicitly rejects a token if the response contains a populated active field set to false (if introspectResp.Active != nil && !*introspectResp.Active). If an introspection endpoint responds with a payload that completely omits the mandatory active key, the internal variable remains nil, causing the conditional check to short-circuit. As a result, Toolbox accepts authorization tokens missing the "active" field, granting access to protected tools and underlying data sources.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 12:23 UTC
CWE
  • CWE-287 - Improper Authentication
Assigner
Google CNA under the Google root
CNA scorecard B 77/100 over 39 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Google MCP Toolbox for Databases (googleapis/mcp-toolbox) Affected: 1.0.0 , ≤ 1.3.0 (semver)
guessed Create a notification for this product.
Credits
HaoNH Leader Redteam From VINCSS ( Member Of Vingroup )
Show details on NVD website
To clipboard 

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