During a web application assessment, you discover that the application exposes predictable numeric account IDs in the URL and fails to verify ownership when those IDs are requested, allowing unauthorized users to access other users' profiles and transaction history. Which web application threat does this scenario best illustrate?
The scenario describes a situation where internal object references (such as account IDs) are exposed to the user. Because the server does not properly enforce authorization checks, an attacker can simply modify the ID value in the URL to access resources that belong to other users. This is known as an insecure direct object reference (IDOR). CSRF relies on a victim's browser submitting unwanted requests, clickjacking tricks a user into clicking hidden elements, and session fixation forces a user to operate under an attacker-chosen session ID. None of these involve manipulating resource identifiers to bypass authorization like IDOR does.
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What is Insecure Direct Object Reference (IDOR)?
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How can web developers prevent IDOR vulnerabilities?
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How does IDOR differ from Cross-Site Request Forgery (CSRF)?
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How does Insecure Direct Object Reference (IDOR) work in web applications?
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What is the difference between IDOR and CSRF?
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How can developers prevent IDOR vulnerabilities?
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