Quick Answer
The correct answer is cookie tampering, because a base64-encoded JSON token stored in a cookie without encryption or integrity checks can be decoded, modified, and re-encoded by an attacker with trivial effort. Since base64 is an encoding scheme, not encryption, anyone who intercepts the 'auth_token' cookie can decode it, change the role to 'admin' or extend the expiration timestamp, then re-encode and resend it to the server, which blindly trusts the client-supplied data. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your understanding of session management flaws and the critical difference between encoding and encryption—a common trap is confusing base64 with actual security. Remember that base64 is not encryption; it is simply a way to represent binary data as text. A useful memory tip: “Base64 is for transport, not for trust—if it’s not signed, it’s ripe for tampering.”
This PT0-002 practice question tests your understanding of attacks and exploits. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization has a web application that stores session tokens in a cookie named 'auth_token'. The token is a base64-encoded JSON object containing the username, role, and expiration timestamp. Which attack is most likely to succeed if the encryption is not used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Session replay
Why wrong: Session replay just reuses a captured token; it doesn't modify it.
Cross-site request forgery
Why wrong: CSRF makes unauthorized requests but does not modify cookies.
Cookie tampering
The tester can decode the cookie, change values, and re-encode to escalate privileges.
Session hijacking
Why wrong: Hijacking steals a session; it does not modify the token.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cookie tampering
Option C is correct because the session token is a base64-encoded JSON object without encryption, making it trivially easy to decode, modify (e.g., change the role to 'admin' or extend the expiration timestamp), re-encode, and send back to the server. This is a classic cookie tampering attack, as the server trusts the client-provided data without integrity verification.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Session replay
Why it's wrong here
Session replay just reuses a captured token; it doesn't modify it.
Cross-site request forgery
Why it's wrong here
CSRF makes unauthorized requests but does not modify cookies.
Cookie tampering
Why this is correct
The tester can decode the cookie, change values, and re-encode to escalate privileges.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Session hijacking
Why it's wrong here
Hijacking steals a session; it does not modify the token.
Common exam traps
CompTIA often tests the distinction between encoding and encryption, and the trap here is that candidates confuse base64 encoding with actual security, assuming it protects the token's integrity or confidentiality.
Detailed technical explanation
Base64 encoding is not encryption; it is a simple binary-to-text encoding scheme that can be reversed by anyone. Without a cryptographic signature (e.g., HMAC) or encryption (e.g., AES), the server has no way to detect if the JSON payload has been altered. In real-world scenarios, this vulnerability is often exploited by changing the 'role' field from 'user' to 'admin' or by extending the 'exp' timestamp to maintain indefinite access.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Attacks and Exploits — study guide chapter
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FAQ
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
The correct answer is: Cookie tampering — Option C is correct because the session token is a base64-encoded JSON object without encryption, making it trivially easy to decode, modify (e.g., change the role to 'admin' or extend the expiration timestamp), re-encode, and send back to the server. This is a classic cookie tampering attack, as the server trusts the client-provided data without integrity verification.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PT0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PT0-002 exam.
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