The answer is SQL injection, as the single quote error is the classic hallmark of this attack. When a web application directly concatenates user input into a database query without sanitization, appending a single quote (') breaks the SQL string delimiter, causing a syntax error that the database exposes. This single quote test is the most straightforward method for identifying a SQL injection vulnerability because it reveals that the input is being interpreted as executable code rather than static data. On the Security+ SY0-701 exam, this scenario tests your understanding of injection flaws and input validation failures, often appearing in a context where you must distinguish SQL injection from cross-site scripting or command injection. A common trap is assuming any error indicates a broken application, but the key clue is that the error is a direct database syntax error triggered by a single character. Memory tip: think of the single quote as a key that unlocks the database—if it causes an error, the door to injection is wide open.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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 web portal builds its database query by directly appending a user's search input. When the user types a single quote, the application returns a database error. Which attack is most likely?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SQL injection
The application directly concatenates user input into a database query without sanitization. When a single quote (') is appended, it breaks the SQL string delimiter, causing a syntax error that the database exposes. This is the classic indicator of a SQL injection vulnerability, where an attacker can manipulate the query structure.
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 scripting
Why it's wrong here
Cross-site scripting affects browser-side script execution, not a backend database query error.
✓
SQL injection
Why this is correct
SQL injection happens when untrusted input alters a database query the application should have protected.
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.
✗
DNS poisoning
Why it's wrong here
DNS poisoning redirects name resolution, which does not explain a database error from search input.
✗
Privilege escalation
Why it's wrong here
Privilege escalation changes user permissions, but the clue here is query manipulation, not account rights.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the immediate symptom (a database error) with cross-site scripting, but the single quote directly points to SQL syntax breakage, not script execution in the browser.
Detailed technical explanation
How to think about this question
Under the hood, SQL injection exploits the lack of parameterized queries or prepared statements. A single quote in a query like SELECT * FROM products WHERE name = '$input' closes the string and allows appending arbitrary SQL, such as OR '1'='1. In real-world scenarios, this can lead to full database enumeration via UNION-based attacks or time-based blind injection when error messages are suppressed.
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 SY0-701 question in full detail.
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SQL injection — The application directly concatenates user input into a database query without sanitization. When a single quote (') is appended, it breaks the SQL string delimiter, causing a syntax error that the database exposes. This is the classic indicator of a SQL injection vulnerability, where an attacker can manipulate the query structure.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SY0-701 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 SY0-701 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.