A Simple PSQL MCP Server’s SQL Injection: Bypassing Read-Only Safeguards

In a recent post, the author reveals a serious vulnerability in a Python-based Model Context Protocol (MCP) server designed to provide AI agents with database access in read-only mode. Despite its intention to restrict operations to harmless SELECT statements, the implementation suffers from naïve input handling that fails to enforce proper access control. Because PostgreSQL allows multiple SQL statements separated by semicolons, an attacker can sneak in commands like “COMMIT; DROP SCHEMA public CASCADE;” to terminate the read-only transaction and execute dangerous write operations. This exploit cleanly bypasses the intended safety measures. The underlying lesson: relying solely on superficial input filtering is dangerously inadequate when interfacing with PostgreSQL, and proper access control mechanisms—beyond just filtering—are absolutely essential. 

https://www.nodejs-security.com/blog/how-to-bypass-access-control-in-postgresql-in-simple-psql-mcp-server-for-sql-injection/

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