PentestLab Blog

Technical, low-level reports on common application vulnerabilities, server hardening, defense-in-depth, and standard penetration workflows.

1 min read vulnerability-analysis

SSRF Vulnerabilities in Document and PDF Parsers: Exploitation and Defense

Many modern web platforms provide features to export system data into PDF formats, such as billing invoices, accounting reports, and resumes. Behind the scenes, these document engines usually share a common architecture: they accept HTML code (or compile it from an application template) and render it into a PDF file using specialized libraries like **wkhtmltopdf**, **WeasyPrint**, **dompdf**, or headless browser instances like **headless Chrome (Puppeteer / Playwright)**.
SSRF Vulnerabilities in Document and PDF Parsers: Exploitation and Defense
1 min read offensive-security

Reverse Engineering Compiled Binary Executables with Ghidra

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Reverse Engineering Compiled Binary Executables with Ghidra
1 min read vulnerability-analysis

Deep Dive into the OWASP API Security Top 10 Standard with Practical Examples

The integration of microservices, mobile apps, and Single Page Applications (SPAs) has shifted the focus of modern web development entirely to APIs. Today, APIs serve more than 80% of all public web traffic. However, traditional Web Application Firewalls (WAFs) are often blind to API logic attacks, as a malicious actor's payload format looks perfectly valid under standard HTTP parsing rules.
Deep Dive into the OWASP API Security Top 10 Standard with Practical Examples
1 min read offensive-security

Exploiting Insecure Deserialization in Python and Node.js

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Exploiting Insecure Deserialization in Python and Node.js
1 min read offensive-security

Modern Penetration Testing: Identifying Vulnerabilities and Exploits

In modern cybersecurity, defending a network requires thinking exactly like an attacker. Penetration testing is the structured simulation of cyberattacks against an enterprise's defense perimeter to identify structural flaws before malicious actors do. ## The OWASP Top 10 Framework Every professional security assessment should start with the **OWASP Top 10**, representing the most critical security risks to web applications:
Modern Penetration Testing: Identifying Vulnerabilities and Exploits
1 min read offensive-security

Exploiting and Mitigating JWT Signature Bypass Vulnerabilities

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Exploiting and Mitigating JWT Signature Bypass Vulnerabilities
1 min read offensive-security

Bypassing WAFs via HTTP Parameter Pollution and Smuggling

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Bypassing WAFs via HTTP Parameter Pollution and Smuggling
1 min read offensive-security

Bypassing Content Security Policies with JSONP and Trusted Types

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Bypassing Content Security Policies with JSONP and Trusted Types
1 min read offensive-security

Advanced SQL Injection Vectors in Modern Object-Relational Mappers

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Advanced SQL Injection Vectors in Modern Object-Relational Mappers
1 min read offensive-security

Abusing OAuth2 Flows for Account Takeover and Token Theft

In the rapidly evolving landscape of modern systems and digital applications, achieving top-tier performance, security, and scalability is no longer optional. This article provides a comprehensive, technically rigorous analysis of current industry standards, exploring architectural paradigms, concrete code patterns, and practical execution checklists to harden and optimize your production systems.
Abusing OAuth2 Flows for Account Takeover and Token Theft