The answer is Insecure Direct Object Reference (IDOR). This is correct because the vulnerability occurs when an application exposes internal object references, such as a user ID in a URL or API parameter, and fails to enforce proper authorization checks before granting access to that resource. By simply changing the ID parameter, an attacker can view or modify another user’s private data without any authentication or permission validation, which is the defining characteristic of an IDOR flaw. On the CompTIA PenTest+ PT0-002 exam, this concept tests your ability to identify broken access control during web application testing—often appearing in scenarios where a tester modifies a numeric or predictable identifier in a request. A common trap is confusing IDOR with broken authentication; remember that IDOR is about missing authorization on an exposed reference, not about weak login credentials. A useful memory tip: IDOR stands for “I Directly Own the Resource” if no one checks if you should.
PT0-002 Attacks and Exploits Practice Question
This PT0-002 practice question tests your understanding of attacks and exploits. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
During a web application test, a penetration tester discovers that the application exposes internal object references (e.g., user ID in a URL) and does not properly authorize access. The tester can view other users' private data by simply changing the ID parameter. Which type of vulnerability does this represent?
Why wrong: CSRF tricks a user into performing actions without their consent, not directly accessing objects by manipulating identifiers.
B
Insecure Direct Object Reference (IDOR)
Correct. The scenario describes exactly this: direct manipulation of an object reference (user ID) to access other users' data without proper authorization.
C
SQL Injection
Why wrong: SQL injection would involve injecting SQL commands, not simply changing a parameter value in a URL to access other records.
D
Cross-Site Scripting (XSS)
Why wrong: XSS involves injecting client-side scripts into web pages viewed by other users, not manipulating object references.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Insecure Direct Object Reference (IDOR)
The vulnerability is Insecure Direct Object Reference (IDOR) because the application exposes internal object references (e.g., user ID in a URL) and fails to enforce proper authorization checks. By simply changing the ID parameter, the tester can access other users' private data without authentication or permission validation, which is the hallmark of IDOR.
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.
✗
Cross-Site Request Forgery (CSRF)
Why it's wrong here
CSRF tricks a user into performing actions without their consent, not directly accessing objects by manipulating identifiers.
✓
Insecure Direct Object Reference (IDOR)
Why this is correct
Correct. The scenario describes exactly this: direct manipulation of an object reference (user ID) to access other users' data without proper authorization.
Related concept
Read the scenario before looking for a memorised answer.
✗
SQL Injection
Why it's wrong here
SQL injection would involve injecting SQL commands, not simply changing a parameter value in a URL to access other records.
✗
Cross-Site Scripting (XSS)
Why it's wrong here
XSS involves injecting client-side scripts into web pages viewed by other users, not manipulating object references.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests IDOR by presenting a scenario where a parameter is manipulated to access another user's data, and the trap is confusing it with CSRF (which involves state-changing actions via forged requests) or SQL injection (which involves database query manipulation), rather than recognizing the core issue as missing authorization on direct object references.
Trap categories for this question
Command / output trap
SQL injection would involve injecting SQL commands, not simply changing a parameter value in a URL to access other records.
Detailed technical explanation
How to think about this question
IDOR occurs when an application uses user-supplied input (e.g., a numeric user ID in a GET parameter like /profile?id=123) to directly retrieve objects from a database or file system without verifying that the requester is authorized to access that specific object. Under the hood, this often stems from missing server-side access control checks, such as failing to compare the requested object's owner ID against the session's authenticated user ID. A real-world scenario is a banking app where changing the account number in a URL allows viewing another customer's transaction history, which could lead to data breaches.
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 team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
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: Insecure Direct Object Reference (IDOR) — The vulnerability is Insecure Direct Object Reference (IDOR) because the application exposes internal object references (e.g., user ID in a URL) and fails to enforce proper authorization checks. By simply changing the ID parameter, the tester can access other users' private data without authentication or permission validation, which is the hallmark of IDOR.
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.
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Question Discussion
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