Analysis
LLM Security Testing | How to Test LLMs for Vulnerabilities
First reported · Discovered femtosec.io
Page published
Earliest dated coverage: 9 Oct 2026 · First observed: 13 Oct 2026 · Latest dated coverage: 9 Oct 2026
Coverage timeline
Single-source analysis — one report is available.
Why it matters
LLM security testing guidance helps defenders systematically probe deployed models and surrounding applications for prompt injection, data leakage, and excessive-agency weaknesses before attackers exploit them.
A guide on LLM security testing explains how to probe large language models and LLM-powered applications with adversarial inputs to find weaknesses such as prompt injection, data leakage, and excessive agency, referencing OWASP's 2025 Top 10 for LLM Applications (where prompt injection ranks first, LLM01) and Microsoft's AI Red Team lessons. It compares LLM testing to traditional pentesting and AI red teaming, and covers methods, tools, metrics, and compliance frameworks.