What do you know about XSS? (Cross-Site Script)

2 min readMay 28, 2024


XSS (Cross-Site Scripting) vulnerability stands out as one of the most prevalent and severe security flaws in the realm of online information security. This vulnerability poses a significant threat to user privacy and data security, making it a crucial topic that individuals and organizations must understand and address.

This video will make you understand in a simple way.

What exactly is XSS?

XSS involves executing scripts on a web page within a user’s browser without their consent or knowledge. This is achieved by injecting malicious script code (such as JavaScript) into a web page, which is then executed when a user visits the infected page. This can lead to malicious commands being executed, such as stealing login credentials, logging keystrokes, or even altering the page’s content.

Why should people care about it?

People should care about XSS because it opens the door to security breaches that can be catastrophic for individuals and organizations alike. By exploiting this vulnerability, attackers can steal sensitive information, such as login credentials or credit card data, and expose systems to the risk of compromise and intrusion. Additionally, XSS vulnerabilities can damage the reputation of websites and companies that fall victim to them, negatively impacting user trust.

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How can it be avoided? There are several steps that can be taken to avoid XSS vulnerabilities and enhance web security:

1. Input sanitization:

Developers should clean and sanitize user-input data to remove any malicious script code before displaying it on the page.

2. Use of security headers:

Security headers such as Content Security Policy (CSP) can be employed to restrict allowed script sources on a web page.

3. Validation:

Websites should validate the input data from users to ensure it conforms to the expected format.

4. Continuous updating:

Websites should continuously update their software and frameworks to patch new security vulnerabilities and ensure ongoing protection against XSS attacks and others.

In summary, XSS vulnerability poses a significant threat to web security and user privacy. Individuals and companies alike must take necessary measures to protect themselves and their websites from this type of malicious attack.