PentesterLab Pro

What is PentesterLab Pro?

PentesterLab Pro is the paid subscription of PentesterLab, a platform specialized in web application security created by Louis Nyffenegger. It offers hundreds of hands-on exercises, each focused on a specific vulnerability, with its own vulnerable environment and a detailed explanation of why the code fails. The free tier includes a selection of exercises; Pro unlocks the full catalog, videos and online labs.

Its strength is not "solving boxes" but understanding each vulnerability class in depth: from a basic SQL injection to JWT attacks, insecure deserialization or cryptographic flaws in cookies.

What it is used for

• Learning web hacking progressively, with short and highly focused exercises.
• Preparing for web certifications such as OSWE, OSWA or eWPT, especially the code review side.
• Training developers in security: seeing the vulnerability in the code helps them avoid repeating it.
• Reproducing real CVEs: many exercises recreate public vulnerabilities in well-known frameworks and libraries.

How it is organized

Content is grouped into badges, which are themed paths. There are introductory badges for beginners and advanced ones covering authentication, serialization, code review or applied cryptography. Completing a badge earns you a certificate of completion.

Each exercise typically has:

1. A brief describing the goal.
2. A vulnerable environment you launch online.
3. Supporting material (text and, in Pro, video) explaining the root cause and how to exploit it.

Recommended learning path

1. HTTP fundamentals: start with the introductory badges to master requests, headers, cookies and sessions.
2. Classic vulnerabilities: SQLi, XSS, command injection, path traversal, file upload.
3. Authentication and sessions: JWT, SAML, OAuth, cookie handling.
4. Code review: exercises where you find the bug in the source code, ideal for OSWE.
5. Serialization and cryptography: attacks on serialized objects in Java, PHP or Ruby, and encryption mistakes.

While practicing, pair the platform with an intercepting proxy such as Burp Suite. Some handy commands for the exercises:

# Inspect response headers and cookies
curl -i http://target.local/login

# Decode the middle part (payload) of a JWT
echo 'eyJ1c2VyIjoiYWRtaW4ifQ==' | base64 -d

# Test a SQL injection automatically
sqlmap -u "http://target.local/item?id=1" --batch --dbs

For quick decoding and data transformation, CyberChef is also very handy. Practice only on the platform environments or on applications you are authorized to test.

Pro tips

• Try first without reading the solution; check the material only when you are truly stuck.
• Write your own exploits in Python instead of relying only on automated tools: that is what OSWE and real audits demand.
• Read the vulnerable code even when the exercise does not require it; understanding the root cause is what lets you spot it elsewhere.
• Keep a log of payloads and techniques by category; it becomes your personal cheat sheet.

Pros and cons

• Pros: huge web-focused catalog, very clear root-cause explanations, short exercises that fit into little time, great preparation for code review.
• Cons: web only (no networks or Active Directory), English-only content, and the isolated-exercise format does not simulate a full pentest.

Alternatives to PentesterLab

• PortSwigger Web Security Academy: free and very complete for web.
• Root Me: hundreds of web and other challenges, free.
• OffSec courses (WEB-200 and WEB-300): if you want a demanding web certification.
• Hack The Box: web modules in the Academy plus full machines.

Frequently asked questions

Is PentesterLab free?

It has free exercises, but most of the catalog, the videos and the online labs require the Pro subscription. Check the current price on the official site.

PentesterLab or PortSwigger Academy?

PortSwigger is free and excellent for classic web vulnerabilities. PentesterLab stands out for code review, real CVEs and advanced topics such as deserialization. Many people use both.

Is PentesterLab good preparation for OSWE?

Yes, it is one of the community's most recommended resources for the code review and web exploit writing side.

Do I need to know how to code?

Not to get started, but reading PHP, Python, Java or Ruby code will help a lot in the advanced badges.

If you want to strengthen Linux, HTTP and command-line skills before diving in, practice at the Hackers en Acción Academy.