CVE-2026-11720
published 2026-06-29CVE-2026-11720: A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox. When constructing downstream API requests, the URL builder…
PriorityP356critical9.1CVSS 3.1
AVNACLPRNUINSUCHIHAN
EPSS
0.37%
29.5th percentile
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).
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mcp_toolbox_for_databases | < 1.3.0 | 1.3.0 |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
nvdv4.09.3CRITICALCVSS: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
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VulDB
Google MCP Toolbox for Databases up to 1.2.x Relative URL /api/v1/users path traversal
vuldb·2026-07-04·CVSS 9.1
CVE-2026-11720 [CRITICAL] Google MCP Toolbox for Databases up to 1.2.x Relative URL /api/v1/users path traversal
A vulnerability was found in Google MCP Toolbox for Databases up to 1.2.x. It has been classified as critical. Affected is an unknown function of the file /api/v1/users of the component Relative URL Handler. This manipulation causes path traversal.
The identification of this vulnerability is CVE-2026-11720. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is recommended.
GHSA
A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox.
ghsa_unreviewed·2026-06-29
CVE-2026-11720 [CRITICAL] CWE-22 A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox.
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 rest
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-06-29
Published