Credential Leakage in LLM Agent Skills: A Large-Scale Empirical Study

A large-scale study of 17,022 third-party LLM agent skills found 520 vulnerable skills with credential leakage issues, identifying 10 distinct leakage patterns. The research reveals that 76.3% of vulnerabilities require joint analysis of code and natural language, with debug logging being the primary attack vector causing 73.5% of credential leaks.