Cybersecurity, learned like a practitioner.
24 learning paths · 398 modules live · every lesson written by someone who has shipped the control or run the engagement. Free to start.
Latest modules
Most recent practitioner playbooks across every track. Filter by topic, level, or search in the sidebar.
XML External Entity Injection (XXE)
XML External Entity (XXE) injection exploits XML parsers that process references to external entities. A classic vulnerability in XML-consuming applications — SOAP services, document upload features, SAML, configuration parsers. Can lead to file disclosure, SSRF, DoS, and RCE. How XXE works XML supports external entities — references to external resources. When a parser fetches the […]
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) is a vulnerability where an attacker tricks a server into making HTTP requests on their behalf. In a cloud environment, SSRF frequently escalates from “interesting” to “full account compromise” via metadata service abuse. The core vulnerability An application takes a URL parameter, fetches it, and returns the response. Classic example: “Enter […]
Active Directory Certificate Services Attacks
Active Directory Certificate Services (ADCS) is how Windows issues certificates — for user authentication, computer authentication, web services, VPN, code signing. It’s also, since SpecterOps’s 2021 “Certified Pre-Owned” research, one of the fastest paths from user to Domain Admin. This module covers the attack classes (ESC1-ESC8+) and defences. ADCS primer Certification Authority (CA) — issues […]
Golden and Silver Tickets
Forged Kerberos tickets are the ultimate AD compromise. A Golden Ticket grants domain-wide impersonation for 10 years. A Silver Ticket grants service-specific impersonation without ever touching the DC. Understanding both is essential for any practitioner serious about AD. Kerberos ticket refresher Two ticket types in a Kerberos flow: TGT (Ticket Granting Ticket) — issued by […]
NTLM Relay Attacks
NTLM Relay is one of the most effective attacks against modern Windows environments — and it works even on fully-patched systems if defenders haven’t enabled specific hardening. This module covers how relay works, common exploit chains, and the defences that actually block it. How NTLM authentication works NTLM is a challenge-response protocol. Client sends NTLM_NEGOTIATE; […]
IPv6 Security — Why You Already Have IPv6 Even If You Did Not Notice
IPv6 is on by default in every modern operating system. If you only configured IPv4 ACLs, half your network is unprotected. This module covers IPv6 addressing (link-local, ULA, GUA), Stateless Address Auto-Configuration (SLAAC), Neighbor Discovery (the ARP replacement and its att
VPN Fundamentals — IPsec, OpenVPN, WireGuard and the Math That Makes Them Work
A VPN tunnels Layer 3 (or Layer 2) traffic over an untrusted network, with confidentiality, integrity, and authentication. The three protocols you need to know are IPsec (the enterprise default), OpenVPN (the legacy SSL VPN), and WireGuard (the modern lightweight default). This m
Firewall and ACL Design — Stateless, Stateful, NGFW, and the Rules That Survive 5 Years
A firewall is just a structured list of "allow / deny" rules applied to traffic. Stateless ACLs filter packet by packet; stateful firewalls track connections; NGFWs add Layer 7 inspection. The trick to firewall design is not picking the product — it is designing rules that are ex
Privilege Escalation Defence
Root escalation — getting from “regular user” to “root” or SYSTEM — is how most breaches turn catastrophic. A foothold becomes domain compromise via privilege escalation. This module covers the technique classes, the defences, and what a practitioner should be able to recognise on both the offensive and defensive sides. The privesc landscape Privilege escalation […]
Container Security Deep Dive
Containers are everywhere in 2026. Docker, Kubernetes, serverless platforms that are containers underneath. This module covers the security concerns specific to the container layer — separate from the Kubernetes module (Cloud Security M4) which focused on orchestration. Here: image supply chain, runtime isolation, secrets, and container escape. What a container is (and isn’t) A container […]
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