Cross-site scripting (XSS) is a security vulnerability in web applications where attackers inject malicious scripts into web pages. There are three main types of XSS: reflected, stored, and DOM-based, which allow attackers to manipulate web application content and steal sensitive information. The consequences of XSS attacks can include reputational damage, legal issues, and significant financial losses for affected companies.

2. What is Cross-Site Scripting (XSS)?
XSS is a security flaw in web applications where attackers inject
malicious scripts into web pages that other users
view and interact with

3. What is Cross-Site Scripting (XSS)?
<script>alert('XSS Detected!');</script

4. Reflected XSS
Occurs when malicious
scripts are embedded in a
URL, which executes when
the URL is visited
Stored XSS
Happens when malicious scripts are permanently
stored on target servers, such as in comment
sections or forums
DOM-based XSS
Involves client-side code
vulnerability where the
document object model (DOM)
environment is manipulated
Types of XSS Attacks

5. How XSS Attacks Work
XSS attacks manipulate web applications to execute malicious
scripts on the user's browser. Attackers craft inputs that are
incorrectly trusted and executed as code by the web application

6. How XSS Attacks Work
Alex
Website

7. Third-party
Components
User Input
Malicious Content
Common Methods of XSS Injection

8. Impacts of XSS
OPTION 01
Attackers can manipulate or deface the
website content seen by users
OPTION 01
XSS can be used to deliver malware to
users
OPTION 01
XSS attacks can allow attackers to steal cookies,
session tokens, or other sensitive information

9. Real-World Consequences
OPTION 01
Reputational Damage
OPTION 01
Legal
Consequences
OPTION 01
Financial
Damage
Companies might face significant
financial losses due to stolen data or
fraud
A successful XSS attack can damage a
company’s reputation
Businesses may face legal actions if
customer data is compromised

10. Detecting XSS Vulnerabilities
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3
4
5
Security Headers Common Signs
Tools for Identification Manual Testing
Code Review

11. Preventing and Mitigating XSS
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3
4
5
Use of Security
Libraries
Input Sanitization
Coding Best Practices Security
Measures
Output
Encoding