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WEB 300

WEB 300 by OffSec Training is an advanced offensive security course for experienced penetration testers and application security engineers who must master complex web application vulnerabilities like deserialization RCE, blind SQLi, and authentication bypass. With over 105 hours of content and 20 challenge labs, it addresses the critical industry need for professionals skilled in white-box testing—where OSWE-certified experts are required to develop custom exploits, a capability demanded by 68% of high-assurance security engagements according to OffSec’s labor market analysis.

This course prepares learners for the OffSec Web Expert (OSWE) certification, featuring a 47-hour, 45-minute proctored exam requiring custom exploit development and professional reporting. Koenig Solutions provides official vendor-authorized courseware with 30-day lab access extensions, ensuring mastery through real-world attack simulations. Graduates gain recognition as elite web exploit developers, positioned to lead red team operations and secure cloud-native applications across global enterprises.

40 Hours (5 Days)
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Course Overview

The OffSec Training WEB 300 course, officially titled Advanced Web Attacks and Exploitation, is designed for experienced penetration testers and security professionals aiming to master advanced web application vulnerabilities and exploitation techniques. This course prepares learners for the OffSec Web Expert (OSWE) certification exam, a highly respected credential in offensive cybersecurity. Ideal for roles such as Application Security Engineer, Exploit Developer, and Bug Bounty Hunter, WEB 300 builds on foundational knowledge from PEN-200 and WEB-200, demanding proficiency in scripting languages like Python and PHP. With web application attacks accounting for over 40% of security breaches according to industry reports, demand for experts trained in deep code analysis and manual exploitation continues to grow among enterprises conducting white-box assessments.

Students engage with real-world platforms including DotNetNuke (DNN), Dolibarr, ERPNext, and ATutor LMS through 20 hands-on Challenge Labs accessible via OffSec’s dedicated lab environment. The curriculum emphasizes practical skills such as source code review, fuzzing, deserialization attack development, and server-side template injection (SSTI) exploitation. Learners use tools like Burp Suite, Nmap, msfvenom, and ysoserial within Kali Linux to analyze vulnerabilities and build custom exploits. A key project involves crafting a single automated proof-of-concept script that chains multiple vulnerabilities—such as authentication bypass and remote code execution—across different applications, simulating real adversarial tactics used in modern red team operations.

Earning the OSWE certification validates elite-level expertise in web application security and is part of the prestigious OSCE³ certification path, which opens doors to senior offensive security roles. Certified professionals report career advancements into high-impact positions with median salaries exceeding $124,910 annually, aligning with U.S. Bureau of Labor Statistics data for information security analysts. Koenig Solutions enhances preparation with Guaranteed-to-Run training, official OffSec courseware, and expert-led mentoring, ensuring candidates develop the deep technical mastery required to pass the rigorous 47-hour, proctored OSWE exam. Graduates emerge equipped to lead complex web assessments and drive robust application defense strategies in enterprise environments.

What You'll Learn

✓Analyze complex source code using WEB 300 methodologies to identify vulnerabilities in Node.js and Python applications.
✓Exploit Server-Side Request Forgery flaws to access internal resources and bypass network security filters.
✓Manipulate JavaScript prototype chains to achieve remote code execution within target environments.
✓Bypass authentication mechanisms by leveraging loose comparison techniques and cryptographic magic hashes in JWT implementations.
✓Execute server-side template injection attacks within WEB 300 lab environments to gain remote code execution.
✓Exfiltrate sensitive data through advanced Blind SQL Injection and XML External Entity vulnerabilities using automated and manual techniques.

Prerequisites

Recommended knowledge before taking this course
  • Basic understanding of web technologies, including HTML, CSS, and JavaScript.
  • Familiarity with common web application architectures and protocols (e.g., HTTP/HTTPS).
  • General knowledge of cybersecurity principles and concepts.
  • Experience with basic programming or scripting (e.g., Python, Bash) is beneficial but not mandatory.
  • Awareness of networking fundamentals and basic operating system navigation.
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Certification Exam

Everything you need to know about the WEB 300 certification exam

Exam Details
Exam Name
Format
Multiple choice, labs & case studies
Questions
Duration
Passing Score
Validity
Retake Policy
The WEB 300 certification does not offer unlimited retakes. Retakes must be purchased individually at $249 per attempt. Maintain professional standards by documenting all attacks and console outputs according to OffSec Training requirements during every exam session.
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WEB 300

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What's Included in Your Training

Every enrollment comes packed with resources to maximise your learning and exam success

Career Outcomes

88%

of WEB 300 certified professionals report career advancement within 6 months

Salary Impact

+32%

Average salary increase reported after obtaining the WEB 300 certification

Typical Salary Range (Global)
Entry$90,000–$115,000
Mid$115,000–$145,000
Senior$145,000–$180,000

*Source: Glassdoor / LinkedIn 2025

Job Roles

6
  • Application Security Engineer
  • Advanced Web Application Penetration Tester
  • Security Researcher
  • Exploit Developer
  • Web Security Specialist
  • Secure Code Reviewer

Companies Hiring

5,000+
Microsoft Google Amazon Goldman Sachs JPMorgan Chase Deloitte Wipro Infosys Razorpay PhonePe

and 5,000+ organizations worldwide seeking WEB 300 certified professionals

Real Transformations

Course Student Reviews

Real results from IT professionals who trained with Koenig — rated 4.9/5 from 18,400+ verified reviews.

18,400+
Verified Reviews
4.9 / 5
Average Rating
95%
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1M+
Professionals Trained
  • ★★★★★

    “Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”

    Rahul M.

    Rahul M.

    Azure Administrator

    AZ-104 Certified ✓ Verified
  • ★★★★★

    “I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    Enterprise Client ✓ Verified
  • ★★★★★

    “The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    PL-300 Certified ✓ Verified
  • ★★★★★

    “From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    AZ-305 Expert ✓ Verified
  • ★★★★★

    “As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    100+ Learners Trained ✓ Verified
  • ★★★★★

    “SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
  • ★★★★★

    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

    David L.

    David L.

    AI Engineer

    AI-102 Certified ✓ Verified
  • ★★★★★

    “DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    AZ-400 Team Training ✓ Verified
  • ★★★★★

    “Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”

    Rahul M.

    Rahul M.

    Azure Administrator

    AZ-104 Certified ✓ Verified
  • ★★★★★

    “I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    Enterprise Client ✓ Verified
  • ★★★★★

    “The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    PL-300 Certified ✓ Verified
  • ★★★★★

    “From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    AZ-305 Expert ✓ Verified
  • ★★★★★

    “As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    100+ Learners Trained ✓ Verified
  • ★★★★★

    “SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
  • ★★★★★

    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

    David L.

    David L.

    AI Engineer

    AI-102 Certified ✓ Verified
  • ★★★★★

    “DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    AZ-400 Team Training ✓ Verified
  • ★★★★★

    “Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”

    Rahul M.

    Rahul M.

    Azure Administrator

    AZ-104 Certified ✓ Verified
  • ★★★★★

    “I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    Enterprise Client ✓ Verified
  • ★★★★★

    “The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    PL-300 Certified ✓ Verified
  • ★★★★★

    “Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”

    Rahul M.

    Rahul M.

    Azure Administrator

    AZ-104 Certified ✓ Verified
  • ★★★★★

    “I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”

    Sarah K.

    Sarah K.

    CISO, Financial Services

    Enterprise Client ✓ Verified
  • ★★★★★

    “The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”

    Ahmed R.

    Ahmed R.

    Business Intelligence Lead

    PL-300 Certified ✓ Verified
  • ★★★★★

    “From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    AZ-305 Expert ✓ Verified
  • ★★★★★

    “As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    100+ Learners Trained ✓ Verified
  • ★★★★★

    “SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
  • ★★★★★

    “From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”

    Priya S.

    Priya S.

    Cloud Solutions Architect

    AZ-305 Expert ✓ Verified
  • ★★★★★

    “As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”

    James T.

    James T.

    Head of L&D, UK Enterprise

    100+ Learners Trained ✓ Verified
  • ★★★★★

    “SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”

    Aisha N.

    Aisha N.

    Security Analyst

    SC-300 Certified ✓ Verified
  • ★★★★★

    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

    David L.

    David L.

    AI Engineer

    AI-102 Certified ✓ Verified
  • ★★★★★

    “DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    AZ-400 Team Training ✓ Verified
  • ★★★★★

    “AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”

    David L.

    David L.

    AI Engineer

    AI-102 Certified ✓ Verified
  • ★★★★★

    “DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”

    Mei W.

    Mei W.

    Data Platform Engineer

    DP-600 Certified ✓ Verified
  • ★★★★★

    “Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”

    Carlos R.

    Carlos R.

    Engineering Manager

    AZ-400 Team Training ✓ Verified

Frequently Asked Questions

Everything you need to know about the WEB 300 training course

Is the WEB 300 certification exam included in the course fee, and what is the cost?
The WEB 300 certification exam is included in the official OffSec Training Course + Cert Bundle for $1,749. This comprehensive package provides one exam attempt, 90 days of lab access, and all required course materials. OffSec does not charge extra for the OSWE exam when purchased within this bundle. This streamlined offering is ideal for candidates pursuing the prestigious OffSec Web Expert (OSWE) certification to advance their careers.
What training formats are available for WEB 300, and does Koenig offer Guaranteed-to-Run scheduling?
Koenig Solutions offers WEB 300 training through live online 1-on-1, public live online, and classroom formats. Every session features our Guaranteed-to-Run scheduling, ensuring your training proceeds regardless of enrollment numbers. Expert instructors deliver official OffSec content, providing real-time mentorship that self-paced learning lacks. We also offer private group sessions for corporate teams, ensuring you gain the practical skills needed to master complex web application security challenges effectively.
How long is lab access provided for WEB 300, and what type of environment is used?
WEB 300 includes 90 days of lab access via a secure, cloud-based OffSec sandbox environment. You will gain hands-on experience with real vulnerable systems like DotNetNuke and Dolibarr. Lab extensions are available for $200 per 30-day block. The environment is designed for advanced exploitation, including deserialization attacks, source code analysis, and chained vulnerability exploitation using industry-standard tools like Burp Suite and Kali Linux to sharpen your offensive security expertise.
What is Koenig's rescheduling and cancellation policy for WEB 300 training?
Koenig allows free rescheduling of WEB 300 training with 10 days' notice; changes within 10 days incur a 50% fee. Cancellations made 15 days or more in advance qualify for a full refund. Only one free reschedule is permitted per enrollment. This policy supports our Guaranteed-to-Run model, ensuring you receive reliable, high-quality live instruction while we maintain the administrative efficiency required to deliver consistent, top-tier professional development for all our students.
What is the format, duration, passing score, and difficulty of the WEB 300 certification exam?
The WEB 300 OSWE exam is a rigorous 47-hour and 45-minute practical challenge. Candidates must exploit multiple systems and submit a comprehensive report within 24 additional hours. This proctored, hands-on exam contains no multiple-choice questions. You must score at least 85 out of 100 points to pass. It effectively tests your advanced ability to perform source code analysis, develop custom exploits, and execute complex chained attacks against modern web platforms.
How long is the WEB 300 certification valid, and what is the renewal process?
The WEB 300 certification, known as the OffSec Web Expert (OSWE), is a lifetime credential that never expires. OffSec maintains that the OSWE, OSCP, and OSWP certifications require no Annual Maintenance Fee (AMF) or continuing education. This permanent validity provides long-term value for security professionals, ensuring your hard-earned expertise in application security and penetration testing remains a recognized asset on your resume throughout your entire career trajectory.
What post-training support does Koenig provide after completing WEB 300?
Koenig provides 30 days of dedicated post-training support for WEB 300. This includes direct mentor access via email, access to recorded sessions, and community forum participation. While OffSec manages lab and exam infrastructure, Koenig supplements your journey with exam preparation guidance and resume-building assistance. We are committed to ensuring you maintain your learning momentum and successfully achieve your OSWE certification goals long after your formal classroom instruction concludes.
What prerequisites or prior experience are recommended for WEB 300?
WEB 300 requires strong scripting proficiency in Python or PHP and solid familiarity with Linux. You should be comfortable using web proxies like Burp Suite and understand core web attack vectors. While there is no formal prerequisite, OffSec strongly recommends completing PEN-200 or possessing equivalent offensive security experience. Success in this course relies on your ability to perform manual code review and develop custom exploits for modern, complex web applications.
What job roles and salary ranges can WEB 300 certification help achieve?
WEB 300 certification qualifies you for high-demand roles like Application Security Engineer, Web Penetration Tester, and Exploit Developer. Industry data indicates annual U.S. salaries ranging from $110,000 to $140,000. The OSWE credential is a top-tier signal for senior-level appsec positions, proving your mastery of white-box testing and custom exploit development. Earning this certification significantly accelerates your career advancement and increases your earning potential in the competitive cybersecurity job market.
How does instructor-led WEB 300 training compare to self-study for exam success?
Instructor-led WEB 300 training significantly improves exam success rates by providing real-time feedback and expert guidance on complex topics like deserialization and SSTI. Live instruction helps you avoid common pitfalls, master exploit chaining logic, and refine the professional reporting skills required for the OSWE exam. Koenig’s Guaranteed-to-Run model ensures accountability and structured pacing, offering a distinct advantage over self-study, which often lacks the direct mentorship necessary to overcome difficult technical hurdles.

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