The Excel to JSON MCP by WTSolutions provides a standardized interface for converting Excel and CSV data into JSON format using the Model Context Protocol. This MCP implementation offers two specific tools for data conversion: excel_to_json_mcp_from_data: Converts tab-separated or comma-separated text data excel_to_json_mcp_from_url: Converts Excel from a provided URL Documentation and Agreement : https://github.com/he-yang/excel-to-json-mcp
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he-yang
Source: modelscope
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Prototype Pollution in sheetJS
SheetJS Regular Expression Denial of Service (ReDoS)
proCodeIf you are using the pro version (with a valid ):Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
4/4 tools missing one or more hints — excel_to_json_mcp_from_data (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); excel_to_json_mcp_from_url (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); excel_to_json_mcp_from_data (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +1 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Readable source code
2 files appear obfuscated
Ship unminified, readable source.
Production dependencies are patched
0 critical, 4 high severity in production deps — @modelcontextprotocol/sdk@1.25.1 (high), @modelcontextprotocol/sdk@1.25.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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