CVE-2026-11720
CVE-2026-11720 is a critical-severity vulnerability in Google Mcp Toolbox For Databases with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- CVSS v4: 9.3
- EPSS exploit prediction: 0% (32nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Google Mcp Toolbox For Databases
- Published:
- Last modified:
Description
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).
Frequently asked questions
- What is 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-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).
- How severe is CVE-2026-11720?
- CVE-2026-11720 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-11720 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-11720?
- CVE-2026-11720 affects Google Mcp Toolbox For Databases. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-11720?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2026-11720 published?
- CVE-2026-11720 was published on 2026-06-29 and last updated on 2026-07-01.
References
Affected products (1)
- cpe:2.3:a:google:mcp_toolbox_for_databases:*:*:*:*:*:*:*:*
More vulnerabilities in Google Mcp Toolbox For Databases
- CVE-2026-14537 — Critical (CVSS 9.8): Incorrect Authorization in the direct HTTP API tool invocation endpoint in Google mcp-toolbox versions v1.3.0 and…
- CVE-2026-11718 — Critical (CVSS 9.1): An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of…
- CVE-2026-11717 — Critical (CVSS 9.1): An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of…
- CVE-2026-11719 — High (CVSS 8.1): An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope…
- CVE-2026-14538 — High (CVSS 7.7): An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of…
- CVE-2026-14541 — High (CVSS 7.5): An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google…
All CVEs affecting Google Mcp Toolbox For Databases →
Other CWE-22 (Path Traversal) vulnerabilities
- CVE-2026-76606 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.3 - ???.
- CVE-2026-18051 — Critical (CVSS 10.0): The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache…
- CVE-2026-74764 — Critical (CVSS 10.0): Pandora contains a path traversal vulnerability in its TAR archive extraction functionality. When processing a…
- CVE-2026-16940 — Critical (CVSS 10.0): The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing…
- CVE-2026-67429 — Critical (CVSS 10.0): Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related…
- CVE-2026-59555 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Deletion in Participants Database <= 2.7.8.3 versions.