Enables AI assistants to interact with the Polish National e-Invoice System (KSeF) for authentication, invoice creation, validation, and retrieval via 30 tools.
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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
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
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)
process.env. You'll be asked to provide them before it can run.KSEF_APPROVAL_MODE— Tryb zatwierdzania: auto / manual Nie manualKSEF_CERT_PATH— Sciezka do certyfikatu Nie -KSEF_DATA_DIR— Katalog danych (drafty, sesja, audit) Nie ~/.ksef-mcpKSEF_ENV— Srodowisko: test / demo / prod Nie testKSEF_KEY_PATH— Sciezka do klucza prywatnego RSA Nie -KSEF_LOG_LEVEL— Poziom logow: debug / info / warn / error Nie infoKSEF_NIP— NIP podmiotu (10 cyfr) Tak -KSEF_RATE_LIMIT_PER_HOUR— Limit zapytan na godzine Nie 1000KSEF_RATE_LIMIT_PER_MINUTE— Limit zapytan na minute Nie 200KSEF_RATE_LIMIT_PER_SECOND— Limit zapytan na sekunde Nie 5KSEF_TOKEN— Token autoryzacyjny KSeF Tak -MCP_PORT— 3400 KSEF_ENV=test node dist/http.js[](https://m8ven.ai/mcp/gacabartosz-ksef-mcp-1az3ri)