Validate static_map_image_tool style path#150
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…atic map URL - Add regex validation to the style parameter to prevent path traversal attacks; accepts only username/style-id with alphanumeric chars, hyphens, and underscores - Apply encodeURIComponent() to each style segment before URL interpolation - Return public URL (without access_token) in text content to avoid leaking credentials to the model context; token is still used internally for the fetch and the MCP Apps iframe URL Reported via HackerOne (2026-03-18) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mattpodwysocki
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Closing in favor of a clean PR without edit history. |
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Summary
Fixes a path traversal vulnerability issue in
static_map_image_tool.Path traversal fix: The
styleparameter was an unvalidatedz.string(), allowing a crafted value like../../tokens/v2to escape the/styles/v1/URL path and proxy authenticated requests to arbitrary Mapbox API endpoints using the server operator's access token. Added a regex constraint (/^[a-zA-Z0-9_-]+\/[a-zA-Z0-9_-]+$/) that accepts only validusername/style-idformat. Also applyencodeURIComponent()to each segment before URL interpolation.Credentials leak fix: The full URL including
?access_token=TOKENwas returned as text content and exposed to the model context. The token is only needed internally for the HTTP fetch and the MCP Apps iframe. Changed to return a public URL (without the token) in the text content block.Test plan
rejects style values with path traversal patterns— verifies traversal payloads (../../tokens/v2,../styles, etc.) are rejected withisError: trueaccess_token=is not present in text content