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HTTP Method Spoofing Cheatsheet

Overview

HTTP Method Spoofing is when a client sends a request that appears to be a safe or allowed HTTP method (POST, GET), but actually instructs the server-side framework to treat it as a different method (PUT, PATCH, DELETE) via a hidden parameter or HTTP header.

Purpose:

• Originally added to support RESTful routes when HTML forms only supported GET and POST.
• Can be abused if access control is weak.

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Writing JavaScript Entirely with Unicode (Escapes & Homoglyphs)

JavaScript can technically be written using only Unicode escape sequences or Unicode homoglyphs. This makes code valid to the JS engine but unreadable or misleading to humans. It is often used in obfuscation, XSS payloads, or supply chain attacks.

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1. Unicode Escapes in Identifiers

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📌 SVG <animate> Cheat Sheet for XSS Payloads

🔹 What is <animate>?

• The <animate> element in SVG is used to animate attributes of another SVG element.
• Host element = the element whose attribute is being animated.
  • If <animate> has no href, the parent element becomes the host.
  • If <animate href="#id"> is present, the host = the element with that ID.

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🛠️ HTML Quirks and XSS Cheat Sheet

A reference of quirks, behaviors, and security-relevant properties in HTML5 + SVG, useful for penetration testing, payload crafting, and filter bypass research.

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HTML Elements Parsing quirks - link mXSS CheatSheet

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XML Ecosystem: Cheatsheet & Quirks

This document provides a high-level overview of major XML technologies. It's designed for developers who need a quick refresher on core concepts, common quirks, and practical examples.

1. XML (eXtensible Markup Language)

The foundation. A markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.

Core Concepts

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📑 URI Schemes & Quirks Cheatsheet (for VAPT)

This cheatsheet summarizes URI schemes, their quirks, encoding tricks, and abuse potential.
Useful for a VAPT engineer’s quick recall.

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1. Common Dangerous URI Schemes

| Scheme | Example | Quirks / Abuse Potential |

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JavaScript Quirks Cheatsheet

This document collects quirks, odd behaviors, and security-relevant details in JavaScript useful for VAPT engineers.

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1. Regex vs Division Ambiguity

throw/1/;

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LLM Security & VAPT Cheatsheet

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APIs

Concept

APIs allow external applications or services to interact with the LLM, usually through REST or GraphQL endpoints.

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URL Override & Forwarded Headers — Cheatsheet

Purpose: Quick reference for headers that can override or indicate original request URL/path/host/proto. Useful for VAPT, debugging reverse proxies, and hardening.

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Common headers

• X-Original-URL — original path before rewrite (IIS, some middlewares)
• X-Rewrite-URL — original path used by IIS/mod_rewrite

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Iframe Developer Cheatsheet

A complete reference for HTML <iframe> properties, attributes, methods, and events.

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🧩 HTML Attributes

Attribute	Description