googleapis/mcp-toolbox vulnerabilities

A path traversal vulnerability exists in the HTTP tool URL builder of googleapis/mcp-toolbox. By supplying path parameters with directory traversal sequences (../), an attacker can bypass configured path restrictions and access unauthorized endpoints on the same target host.

An authentication bypass vulnerability exists in the opaque token validation path of googleapis/mcp-toolbox. This flaw allows the acceptance of tokens issued by unauthorized identity providers when the external OAuth provider's response omits the 'iss' field.

An authentication bypass vulnerability exists in the googleapis/mcp-toolbox that allows bypassing authentication. The issue is related to opaque token validation, where the absence of the 'active' key in the OAuth 2.0 introspection response results in the acceptance of tokens that should not be considered valid.

The cloud-healthcare-fhir-fetch-page tool in googleapis/mcp-toolbox is vulnerable to SSRF and credential exfiltration. An unvalidated pageURL parameter triggers HTTP requests with an Authorization: Bearer header to arbitrary hosts, leaking OAuth tokens.

SQL injection and security boundary bypass vulnerability in the bigquery-forecast tool of googleapis/mcp-toolbox. An attacker can inject malicious SQL queries via client-controlled parameters, bypassing the allowedDatasets mechanism and accessing arbitrary BigQuery tables.