- A
SQL injection
Why wrong: This targets relational databases using SQL queries. MongoDB is a NoSQL database and does not use SQL syntax, so this technique would not work.
- B
NoSQL injection
This is the correct technique because the application uses MongoDB and directly interpolates user input into queries. NoSQL injection manipulates the query logic by injecting operators like $gt or $ne.
- C
LDAP injection
Why wrong: LDAP injection targets Lightweight Directory Access Protocol services, not NoSQL databases. It is used to manipulate LDAP queries to access directory information.
- D
Command injection
Why wrong: Command injection enables execution of operating system commands via the application, but the vulnerability here is in database query construction, not in command execution.
Quick Answer
The correct answer is NoSQL injection because the application directly interpolates unsanitized user input into a MongoDB query, allowing the tester to inject operators like $ne, $regex, or $gt to manipulate query logic and extract data. This technique exploits MongoDB’s JSON-based query syntax rather than SQL syntax, enabling attackers to bypass authentication or retrieve records by altering the query’s conditional structure. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to distinguish between SQL and NoSQL injection, as MongoDB’s use of operators such as $ne (not equal) or $regex (pattern matching) is a common trap—many testers mistakenly try classic SQL injection payloads. A strong memory tip: think of MongoDB injection as “operator injection” where you replace a value with a JSON object containing a dollar-prefixed operator to change the query’s logic.
PT0-002 Attacks and Exploits Practice Question
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.
A penetration tester gains access to a web application that uses a MongoDB backend. The tester discovers that the search functionality directly interpolates user input into a NoSQL query without sanitization. Which technique should the tester use to extract data from the database?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NoSQL injection
Option B is correct because the application uses MongoDB, a NoSQL database, and the search functionality directly interpolates user input into a NoSQL query without sanitization. This allows the tester to inject MongoDB operators (e.g., $ne, $regex, $gt) to manipulate the query logic and extract data, which is the core of NoSQL injection. Unlike SQL injection, this technique targets MongoDB's query syntax, such as JSON-based operators, to bypass authentication or retrieve records.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SQL injection
Why it's wrong here
This targets relational databases using SQL queries. MongoDB is a NoSQL database and does not use SQL syntax, so this technique would not work.
- ✓
NoSQL injection
Why this is correct
This is the correct technique because the application uses MongoDB and directly interpolates user input into queries. NoSQL injection manipulates the query logic by injecting operators like $gt or $ne.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
LDAP injection
Why it's wrong here
LDAP injection targets Lightweight Directory Access Protocol services, not NoSQL databases. It is used to manipulate LDAP queries to access directory information.
- ✗
Command injection
Why it's wrong here
Command injection enables execution of operating system commands via the application, but the vulnerability here is in database query construction, not in command execution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'injection' and default to SQL injection (Option A) without recognizing that the backend is MongoDB, a NoSQL database, which requires a different injection technique using JSON operators rather than SQL syntax.
Trap categories for this question
Command / output trap
Command injection enables execution of operating system commands via the application, but the vulnerability here is in database query construction, not in command execution.
Detailed technical explanation
How to think about this question
NoSQL injection in MongoDB often exploits the fact that user input is parsed as part of a JSON query object, allowing injection of operators like $regex to perform blind extraction or $where to execute JavaScript. For example, injecting {"$ne": ""} into a password field can bypass authentication by making the condition always true. In real-world scenarios, this technique is used to enumerate data character by character using $regex patterns, similar to blind SQL injection but with MongoDB-specific syntax.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PT0-002 question test?
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: NoSQL injection — Option B is correct because the application uses MongoDB, a NoSQL database, and the search functionality directly interpolates user input into a NoSQL query without sanitization. This allows the tester to inject MongoDB operators (e.g., $ne, $regex, $gt) to manipulate the query logic and extract data, which is the core of NoSQL injection. Unlike SQL injection, this technique targets MongoDB's query syntax, such as JSON-based operators, to bypass authentication or retrieve records.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 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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