XSS prevention in templates in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is XSS and why is it a security risk in web applications?

XSS (Cross-Site Scripting) is when attackers inject harmful scripts into web pages viewed by others. It can steal data, hijack user sessions, or change page content, making it a serious security risk.

beginner

How does Vue.js prevent XSS attacks by default in templates?

Vue automatically escapes HTML special characters in template expressions, so user input is shown as text, not code. This stops scripts from running inside the page.

intermediate

What is the risk of using the v-html directive in Vue templates?

v-html inserts raw HTML into the page without escaping. If the HTML comes from untrusted sources, it can run malicious scripts and cause XSS attacks.

intermediate

Name two best practices to avoid XSS when using Vue templates.

1. Avoid using v-html with untrusted content. 2. Always sanitize any HTML before inserting it. 3. Use Vue's default template syntax for binding text.

advanced

How can you sanitize HTML content before using it with v-html in Vue?

Use a trusted library like DOMPurify to clean the HTML string by removing unsafe tags and attributes before binding it with v-html.

What does Vue do by default to prevent XSS in templates?

A Automatically sanitizes all HTML content

B Escapes HTML special characters in template expressions

C Disables JavaScript execution in the browser

D Blocks all user input

Vue escapes HTML special characters in template expressions to show user input as text, preventing scripts from running.

Which Vue directive can cause XSS if used with untrusted content?

A v-html

B v-if

C v-bind

D v-text

v-html inserts raw HTML without escaping, so untrusted content can run scripts and cause XSS.

What is a safe way to display user input in Vue templates?

A Insert input into innerHTML manually

B Use v-html directly

C Use template expressions with double curly braces {{ }}

D Disable Vue's escaping feature

Using {{ }} escapes HTML characters, showing input as text safely.

Which tool can help sanitize HTML before using it with v-html?

A DOMPurify

B jQuery

C Axios

D Lodash

DOMPurify cleans HTML strings by removing unsafe code, preventing XSS.

Why should you avoid using v-html with user-generated content?

A It breaks CSS styles

B It slows down the app

C It disables Vue reactivity

D It can cause XSS attacks if content is not sanitized

Untrusted HTML can contain scripts that run when inserted with v-html, causing XSS.

Explain how Vue's template syntax helps prevent XSS attacks.

Think about how Vue treats {{ userInput }} in templates.

Describe the risks of using v-html and how to safely use it in Vue applications.

Consider what happens if untrusted HTML is inserted directly.