An MCP server for interacting with Kanton Luzern tax declarations on eSteuern.LU, enabling field catalogue search and live declaration editing.
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
fast-xml-parser has an entity encoding bypass via regex injection in DOCTYPE entity names
fast-xml-parser has RangeError DoS Numeric Entities Bug
fast-xml-parser affected by numeric entity expansion bypassing all entity expansion limits (incomplete fix for CVE-2026-26278)
fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)
fast-xml-parser has stack overflow in XMLBuilder with preserveOrder
process.env. You'll be asked to provide them before it can run.ETAX_DECLARATION_ACCESS_CODE— yes Zugangscode eFiling from the tax letterETAX_DECLARATION_ID— no Pin a declaration so editing tools can omit idETAX_DECLARATION_PERS_ID— yes PersID from the tax letter (for create_declaration)ETAX_LANGUAGE— no Declaration language; defaults to deETAX_LOGIN_EMAIL— yes Keycloak login emailETAX_LOGIN_PASSWORD— yes Keycloak login passwordHOST— The server listens on http://127.0.0.1:3000/mcp using the MCP streamable HTTP transport. Override the bind address with the and PORT environment variables.PORT— The server listens on http://127.0.0.1:3000/mcp using the MCP streamable HTTP transport. Override the bind address with the HOST and environment variables.[](https://m8ven.ai/mcp/domwoe-luzern-etax-mcp-z8wmvx)