2. Cross-Site Scripting (XSS)

2. Cross-Site Scripting (XSS): XSS is like posting a sticky note with a small hidden trick device on a school bulletin board that steals the lunch money of anyone who looks at th

XSS is like posting a sticky note with a small hidden trick device on a school bulletin board that steals the lunch money of anyone who looks at the board.

2 Analogies: Explaining XSS

Poisoned Bulletin Board

Tricky Postal Envelope

2 Reasonings: Why Does It Happen?

Browser's Blind Trust

Lack of HTML Escaping

2 LEGO Analogies: Sanitization Blocks

Vulnerability Simulation

Which harmless test payload is most commonly used to verify XSS vulnerabilities?

SELECT * FROM secrets

../../../../etc/passwd

alert('XSS') causes a pop-up alert box in the browser. If the box appears, it proves client-side scripts can execute.

What type of data does an attacker target most frequently with XSS?