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The Ultimate AI/LLM/ML Penetration Testing Training Course (Udemy.com)

Become professional in finding and exploiting AI/LLM vulnerabilities. For Ethical Hackers, Bug Hunters and Pentesters.

Created by: Martin Voelk

Last updated September 2026

Our take

Based on the ratings of 1,679 students, a sample of their written reviews and the syllabus, as the course stood in September 2026. No course pays to be reviewed.

Martin Voelk's course is a long, hands-on tour of attacking AI and LLM apps. It follows the OWASP Top 10 for LLMs and the newer list for agentic applications, then moves into jailbreaking, AI browsers, coding agents, MCP servers and multimodal attacks. The syllabus shows 498 lectures and about 42 hours, with a long tail of optional CTF walkthroughs. It fits pentesters and bug hunters moving into AI targets best, even though the listing also welcomes beginners.

Reviewers like the practical demos, the mix of theory and lab solutions, and the way Martin explains his thinking as he goes. Of 1,679 ratings, 858 are five stars and 630 are four. The complaints are consistent, though. Some say the course feels disorganized, with topics repeated and video titles that don't match the content. Others mention dated material, services that no longer exist, patchy audio and padding. One reviewer says it could be cut by half, and another hit playback glitches and a silent lecture.

The course was last updated in September 2026, which matters in a field where labs get pulled and models change. Martin says openly that some labs may vanish and some techniques may need tuning. If you already know the basics of web security and want a broad, practical catalogue of AI attacks, this fits well. If you want a polished, linear path, look elsewhere.

Best forPentesters and bug bounty hunters who want to add AI, agent and MCP targets to their toolkit.
Skip it ifYou want a tightly edited, well-ordered course with clean audio and no repeated material.

Pros

  • Covers the OWASP LLM and Agentic Top 10s, then jailbreaks, MCP, AI browsers and coding agents
  • Reviewers like the real-world demos and seeing Martin explain his thought process
  • Updated September 2026, with walkthroughs for PortSwigger, Finbot and many CTFs
  • Theory for each vulnerability, not just lab solutions, according to reviewers

Cons

  • Reviewers report repeated topics, loose ordering and video titles that don't match the content
  • Some material is dated and a few services shown in the videos no longer exist
  • Audio and playback complaints, and one reviewer calls it padded by about half
Martin did a great job with the concepts covered in this course! I want to double tap the 5 stars because of the real world testing tools and examples.
Samuel Dixon, a student

Billed as all levels, but it suits people who know web basics. Experienced hackers may find some demos light.

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What you will learn

  • Find and exploit prompt injection: direct, indirect, hidden/obfuscated, memory abuse, and data exfiltration
  • Attack AI agents and tool use: unwanted actions, delayed tools, excessive agency, and agent kill chains
  • Test MCP servers and plugins: tool poisoning, path issues, auth bypass, and malicious MCP setups
  • Break AI browsers and coding agents (Claude, Copilot, Cursor-style tools, Antigravity, and similar)
  • Jailbreak modern models and leak system prompts across ChatGPT, Claude, Gemini, Grok, and others
  • Cover OWASP Top 10 for LLMs and OWASP Top 10 for Agentic Applications with theory plus hands-on labs
  • Practice on real labs and CTFs (PortSwigger, Finbot, Gandalf, Wraith, AIPWN, and many more)
  • Use AI red-team tooling such as Garak, Promptmap, MCP scanners, Leakhub, and related utilities
  • Abuse multimodal and supply-chain paths: image/audio/video injection, embeddings, and model/data risks
  • Build offensive skills for AI/LLM penetration testing, red teaming, and bug bounty work

Course content

33 sections · 498 lectures · 42 hours of video

  1. 1Introduction 3 free previews6 lectures · 1.1 hours
  2. 2Prompt Injection12 lectures · 1.9 hours
  3. 3Prompt Injection (Indirect)14 lectures · 1.1 hours
  4. 4Prompt Injection (Agentic Actions)25 lectures · 2.2 hours
  5. 5Prompt Injection (Data Exfiltration)14 lectures · 1.1 hours
  6. 6Prompt Injection (Memory Manipulation)6 lectures · 23 min
  7. 7Prompt Injection (Hidden and Obfuscated)10 lectures · 40 min
  8. 8Sensitive Information Disclosure10 lectures · 1 hour
  9. 9Supply Chain Vulnerabilities3 lectures · 19 min
  10. 10Model and Training Data Poisoning4 lectures · 29 min

Who it is for

The instructor says it suits

  • Beginners who want a practical path into AI/LLM penetration testing and AI red teaming
  • Ethical hackers, pentesters, and bug bounty hunters expanding into AI and LLM targets
  • Security engineers and SOC/AppSec folks who need to understand how AI apps get attacked
  • Developers and AI builders who want to see real attack patterns against agents, tools, and prompts
  • Anyone preparing for AI/LLM security certifications or hands-on AI security labs and CTFs
  • Not for people looking for a pure theory/policy course with no demos — this is heavily practical

What you need before you start

  • Basic computer and internet skills (browse the web, install apps, follow on-screen steps)
  • Basic understanding of how websites and web apps work (helpful, not advanced)
  • No prior hacking, Linux, or programming experience required — everything is shown step by step
  • A computer with at least 4GB RAM (Windows, macOS, or Linux)
  • A reliable internet connection and any modern web browser
  • Willingness to practice only on systems you own or have permission to test

How it compares

Against the other 523 rated Udemy courses in Hacking on CourseDuck:

  • Rating4.5 out of 5higher than 51% of them
  • Reviews1,679#130 of 524 by number of reviews
  • Length41.8 hourslonger than 98% of them
  • Last updatedSeptember 2026more recently than 94% of them

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Course Description

The Ultimate AI/LLM Penetration Testing Course

Your instructor is Martin Voelk, a cybersecurity veteran with 27 years of experience. Martin holds AIRTP+, multiple SecOps certifications including the AI certifications, CISSP, OSCP, OSWP, PortSwigger BSCP, and Cisco CCIE. He works at a startup and hunts bugs in bug bounty programs, where he has found thousands of critical and high-severity vulnerabilities.

This course mixes short theory with hands-on labs so you can find and exploit vulnerabilities in AI and LLM apps. It follows the OWASP Top 10 for LLMs and the OWASP Top 10 for Agentic Applications. Videos are practical and easy to follow along.

What you'll cover (core content)

· Prompt injection — direct, indirect, agentic actions, data exfiltration, memory abuse, and hidden/obfuscated payloads

· Sensitive Information Disclosure

· Supply Chain

· Data and Model Poisoning

· Improper Output Handling

· Excessive Agency

· System Prompt Leakage

· Vector and Embedding Weaknesses

· Misinformation

· Unbounded Consumption and DoS

· OWASP PwnzzAI Shop labs

· OWASP Top 10 for Agentic Applications + OWASP Finbot labs

· PortSwigger - Agentic AI Labs

· SecOps Group AI/ML and Agentic mock exam walkthroughs

· Jailbreaking modern models

· AI Browsers Attacks

· AI Coding Agents Attacks

· MCP Attacks

· Multimodal Attacks (Images, Audio and Video)

· Red-team Tooling

CTF walkthroughs (optional)

Practice as many as you want after the core content:

· Deniskim CTF

· Prompt Airlines CTF Challenge Walkthrough

· Selara Jailbreak Game CTF

· Gandalf Agent Breaker CTF

· Hack The Agent CTF

· AI Prompt Attack and Defense Game Tensortrust CTF

· Crowdstrike AI Unlocked Challenge CTF

· Game Arena Challenges CTF

· PromptTrace Prompt Injection Labs CTF

· PromptInjects CTF

· 8ksec CTF

· AIPWN CTF

· Bot Tricks CTF

· Wraith CTF

· Other CTFs

Archive (legacy labs)

Kept for practice; techniques may still apply:

· Legacy OWASP Finbot CTF

· Legacy Gandalf lab

Notes & Disclaimer

I keep this course updated, but it will not always include every new AI bug the day it appears.

Some students want older CTFs removed; others want them kept. All CTF walkthroughs sit after Tooling and are optional — watch all, some, or none.

Most labs are free online. I don't control if owners take them down. If a lab disappears, the methods still apply to other labs and real targets you are allowed to test.

LLM providers change models often. Many techniques still work; some may need tuning later.

Use this only on systems you own or have clear permission to test. No unauthorized or malicious use.

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Instructor Details

Martin Voelk

Hello! I’m an IT and cybersecurity veteran with 27 years of experience across ISPs, banks, manufacturers, government, and many other industries.

Today I focus on offensive AI security - AI/LLM penetration testing, AI red teaming, agentic attacks, and bug bounty work. I work at an AI security startup and teach practical AI hacking on Udemy.

I previously ran a penetration testing company, Cyber 51 LLC, which I sold in 2018. Before that I worked as a senior penetration tester across infrastructure, web, mobile, wireless, IoT, and AI.

Focus areas
Offensive AI security / AI red teaming / LLM penetration testing
Penetration testing (web, infrastructure, mobile, wireless, IoT)
Application security
Network security
OSINT and cyber investigations

AI red teaming certifications
AI Red Teaming Professional / AIRTP+ (Learn Prompting)
Certified AI/ML Pentester (SecOps Group)
Certified Agentic AI Pentester (SecOps Group)

Penetration testing certifications:
BSCP (Burp Suite Certified Practitioner)
OSCP (Offensive Security Certified Professional)
OSWP (Offensive Security Wireless Professional)
CREST Registered Penetration Tester (UK) (retired)
CEH v8 (retired)

General security certifications
CISSP #339608

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Reviews

4.5

1,679 ratings on Udemy

Select a bar to show only those reviews.Select the bar again to show every rating.

By Karola Moster on 6/25/2026

Sehr zufrieden mit der Vielfalt an Informationen und Praxisbeispielen. Was etwas schade ist: viele Lektionen blieben "hängen" (Wiedergabefehler) und einmal hatte komplett der Ton gefehlt.

By Tanish Chhabra on 6/6/2026

The course is really comprehensive and covers everything. It doesn't just contains solutions to labs (which I expected it to have) but also covers the theory regarding each vulnerability. This combination of theory and practical makes it an all-rounder course for gaining mastery on the topic.

By Rene Wilmes on 2/16/2026

The course was very interesting and the instructor is highly knowledgable. He even demonstrated a couple of practical exercises and explaiend his thought process, which I found incredebly helpful as well.

By Celine Blandin on 1/30/2026

An outstanding and very comprehensive course, packed with hands-on demos and realistic attack scenarios. It dives deep into AI/LLM/ML penetration testing with concrete examples, showing how vulnerabilities are actually exploited and tested in real systems. Far beyond theory, this course provides practical techniques, tooling, and a true attacker-mindset that is directly applicable to real-world AI security and Red Team work.

By Anil Patel on 1/14/2026

very much theoretical and not understanding as well as neither updated nor getting refund

By Nick Review on 12/31/2025

Overall, the course content is solid and provides many useful learning resources, including CTF labs, external websites, and GitHub repositories. However, the material would benefit from better organization, as links and resources are scattered throughout the content rather than centralized. Additionally, there are some inaccuracies in the slides (for example, section 6, chapter 79, it says improper output handling is LLM02 when it should be LLM05) I feel that the Intro sections/theory sections can be merged into one lesson as there is redundant material covered in both sections. Consolidating all referenced resources into a single downloadable package per chapter would also greatly improve usability as well.

By Valerio Mendolia on 8/26/2025

This was a fascinating course, and I'd recommend it to anyone. Martin is a fantastic teacher! He has a gift for explaining each step perfectly and makes complex topics seem simple. I highly recommend this course to everyone!

By Nathan Dee on 6/4/2025

This course was very informative. I feel there was repetition in parts which may have lengthened out the course more than it needed to be but this also helped send home important points.

By Dr. Erlijn van Genuchten on 2/26/2025

I loved this course. I not only enjoyed doing it but also enjoyed doing the practical exercises to tests the knowledge and skills I obtained in the course. I have many years of penetration testing experience, which helped a lot to get the concepts quickly, but it was also all very well explained which helped even more. I was also able to do the final tests without cheating based on the course. Thanks a lot Martin!

By Paul on 2/7/2025

Martin has managed to structure the information about penetration testing AI. For this course the information is enough to understand and make a clear picture about the topic without being overburden or boring because it is too much. I really enjoyed the truth behind the curtains, when he mentions that this took me half a day or you need to repeat the prompt sometimes. I highly appreciate the number of resources he shared and playground to sharpen my skills. Thank you Martin, hope this message reach you to :)

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Overall Score : 90 / 100