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MCP Toolbox CVE-2026-11720

| EUVDEUVD-2026-40146 CRITICAL
Path Traversal (CWE-22)
2026-06-29 cve-coordination@google.com GHSA-vwxw-jrg6-9jxv
Path Traversal Mcp Toolbox For Databases
9.3
CVSS 4.0 · Vendor: google
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Severity by source

Vendor (google) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.1 CRITICAL

Tool caller controls pathParams with no extra privileges or interaction (PR:N/UI:N/AC:L/AV:N); traversal exposes and lets the credentialed client act on restricted endpoints (C:H/I:H), no availability impact (A:N).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (google).

CVSS VectorVendor: google

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jun 29, 2026 - 19:01 EUVD
Analysis Generated
Jun 29, 2026 - 18:30 vuln.today

DescriptionCVE.org

A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox.

When constructing downstream API requests, the URL builder substitutes user-controlled pathParams into the configured tool path and parses the resulting string as a relative URL. While it checks that the input does not alter the scheme, host, or user info, it relies on ResolveReference for the final URL resolution. Because dot segments (../) are normalized during this resolution step, an attacker can supply path parameters containing directory traversal sequences to escape the operator-configured path scope. This allows the client to coerce the toolbox into making requests to unintended endpoints on the same target host while forwarding the toolbox's configured credentials (e.g., bypassing a restricted path like /api/v1/users/{{.id}} to reach /admin/secrets).

AnalysisAI

{{.id}} to sensitive endpoints such as /admin/secrets. Carries a CVSS 4.0 base score of 9.3 (critical); there is no public exploit identified at time of analysis and it is not listed in CISA KEV.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach toolbox HTTP tool interface
Delivery
Inject pathParam with ../ traversal
Exploit
Bypass scheme/host checks, normalize path
Execution
Toolbox requests unintended same-host endpoint with credentials
Impact
Exfiltrate or alter restricted data
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Vulnerability AssessmentAI

Exploitation Requires that the toolbox is deployed with an HTTP tool whose configured path embeds caller-controlled pathParams (e.g., a path template like /api/v1/users/{{.id}}) and that the attacker can invoke that tool. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H) describes a network-reachable, low-complexity, unauthenticated path with high confidentiality and integrity impact, consistent with the description in which any client able to invoke the tool can inject traversal sequences with no special privileges. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can invoke a vulnerable HTTP tool supplies a path parameter such as '../../admin/secrets' for a tool configured to call /api/v1/users/{{.id}}; the URL builder passes scheme/host/userinfo checks but ResolveReference normalizes the traversal, so the toolbox issues an authenticated request to /admin/secrets on the same host using its configured credentials and returns the response. Given AV:N/AC:L/PR:N/UI:N, this requires only the ability to call the tool with crafted parameters and no special timing or user interaction; no public POC was provided in the source data.
Remediation Upstream fix available (PR/commit); released patched version not independently confirmed - apply the change in https://github.com/googleapis/mcp-toolbox/pull/3218 and upgrade to the first tagged release that includes it once published. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running affected versions; audit access logs for evidence of exploitation; implement network-level access restrictions to /admin/secrets and similar sensitive endpoints. …

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CVE-2026-11720 vulnerability details – vuln.today
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