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Part 4: Cross-Site Scripting (XSS) Series - Stored XSS – A Deep Dive
- Stored Cross-Site Scripting (Stored XSS) is a dangerous type of XSS vulnerability that can affect every user who accesses the affected page.
- Stored XSS vulnerabilities arise in applications that accept and store untrusted user input without proper validation or sanitization.
- The web application stores this input in a database or file system without properly sanitizing it. The input is then displayed to other users who access the page containing this data.
- When another user visits the page containing the stored malicious script, the malicious JavaScript code executes in their browser.
- Attackers exploit stored XSS vulnerabilities by performing reconnaissance, payload crafting, delivering the attack, and exploitation.
- To prevent stored XSS vulnerabilities, developers and security professionals should employ secure coding practices.
- Regular security audits are necessary to identify potential security issues in web applications.
- Detecting stored XSS vulnerabilities can be done through both manual and automated techniques.
- Tools like XSS Hunter and XSStrike can provide more advanced payloads and detect subtle XSS flaws.
- Stored XSS is a powerful and persistent attack vector that can have severe consequences for both users and organizations.
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