A security analyst observes that a web application assigns sequential session identifiers and fails to generate a new identifier after a user successfully authenticates. Which vulnerability could an attacker exploit to impersonate other users by reusing or predicting these session IDs?
When session identifiers are weak, sequential, or not regenerated at critical points (such as after authentication), an attacker can capture, guess, or reuse them to impersonate a legitimate user. This type of attack is called session hijacking. Robust session management requires random, high-entropy identifiers that are refreshed after login and other privilege-escalation events. SQL injection, cross-site scripting, and buffer overflow exploit entirely different weaknesses and do not rely on predictable session IDs.
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Why is it important to regenerate session IDs after a successful login?
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What makes a session ID high-entropy and more secure?
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How is session hijacking different from cross-site scripting (XSS)?