CVE-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 substitutes user-controlle
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).
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-11720
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-117200.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-11720 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for A path traversal
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownCVE-2026-42219: Frappe is a full-stack web application framework. Prior to 16.19.0 and 15.109.0, path traversa…nvd · 2026-07-10
- unknownCVE-2026-41482: Frappe is a full-stack web application framework. Prior to 16.18.3, possible path traversal an…nvd · 2026-07-10
- highCVE-2026-58499: EverOS is a memory runtime for agents. Prior to 1.0.1, EverOS is vulnerable to path traversal …nvd · 2026-07-10
- mediumCVE-2026-55469: Snipe-IT is an IT asset/license management system. Prior to 8.6.2, an authenticated user with …nvd · 2026-07-10
- highGHSA-p4m3-mgmm-c664: SiYuan: Path Traversal via Double URL Encoding in /assets/*path (publish mode arbitrary f…ghsa · 2026-07-10
- highCVE-2025-70796: An unauthenticated path traversal vulnerability exists in the web management interface of WTI …nvd · 2026-07-10
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