Hidden HTML form fields are a common mechanism for transmitting data via the client in a superficially unmodified way. If a field is flagged as hidden, it is not displayed on-screen. However, the ...

If an application is vulnerable to the CL.TE variant of request smuggling, then sending a request like the following will often cause a time delay: The timing-based test for TE.CL vulnerabilities will ...

In some situations, an application that is vulnerable to SQL injection (SQLi) may implement various input filters that prevent you from exploiting the flaw without restrictions. For example, the ...

LDAP injection arises when user-controllable data is copied in an unsafe way into an LDAP query that is performed by the application. If an attacker can inject LDAP metacharacters into the query, then ...

Generally speaking, it is important not to develop "tunnel vision" during testing. In other words, you should avoid focussing too narrowly on a particular vulnerability. Sensitive data can be leaked ...

Stored cross-site scripting (also known as second-order or persistent XSS) arises when an application receives data from an untrusted source and includes that data within its later HTTP responses in ...

In this section, you'll learn how simple file upload functions can be used as a powerful vector for a number of high-severity attacks. We'll show you how to bypass common defense mechanisms in order ...

In this section, we'll cover the basics of the two most common OAuth grant types. If you're completely new to OAuth, we recommend reading this section before attempting to complete our OAuth ...

This lab contains a reflected cross-site scripting vulnerability in the search query tracking functionality where angle brackets and double are HTML encoded and single quotes are escaped. To solve ...

Malware – short for ‘malicious software’ – refers to code, scripts, or other forms of software created with some malign intent. Types of malware attack campaigns include banking trojans, ransomware, ...

Access control is the application of constraints on who or what is authorized to perform actions or access resources. In the context of web applications, access control is dependent on authentication ...

In this section, we'll look at what DOM-based XPath-injection is, discuss the potential impact of this kind of vulnerability, and suggest ways to reduce your exposure to them. DOM-based ...