No-Box Vulnerability Analysis: Description-only Detection of Indirect Prompt Injection Vulnerabilities in MCP Servers

Researchers have introduced a method to identify indirect prompt injection vulnerabilities in Model Context Protocol servers without needing direct system access or dynamic interaction. This approach allows third-party auditors to analyze closed-source or remotely hosted systems by relying solely on functional descriptions. The technique addresses a gap in security auditing for commercial AI integrations where traditional diagnostic methods are often restricted or unavailable.