CVE-2026-45805 Penpot: MCP REPL server binds to 0.0.0.0 with unauthenticated /execute endpoint — RCE

Penpot is an open-source design tool for design and code collaboration. Prior to 2.15.0, Penpot MCP's mcp/packages/server/src/ReplServer.ts bound the ReplServer to 0.0.0.0:4403 and exposed an unauthenticated /execute endpoint that passed the code field to PluginBridge.executePluginTask, allowing...

PenPot MCP REPL server binds to 0.0.0.0 with unauthenticated /execute endpoint — RCE

Summary The MCP module's ReplServer binds to all interfaces 0.0.0.0:4403 and exposes a /execute endpoint that runs arbitrary code with zero authentication. Anyone on the network can POST JavaScript and it runs on the server. The main PenpotMcpServer was partially fixed for a similar binding issue...