Quick Answer
The correct answer is that security testing was skipped during development, as this represents the primary finding for an IS auditor reviewing the system development process. This is because the absence of formal security testing—such as static or dynamic analysis and penetration testing—directly violates secure development lifecycle (SDLC) best practices, allowing an input validation flaw to remain undetected and exploited. On the CISA exam, this scenario tests your ability to distinguish between a root cause process failure and its downstream effects, like the specific vulnerability or financial loss, which are secondary. A common trap is focusing on the exploit or dollar amount rather than the missing control in the development phase. Remember the memory tip: “Process before payload”—the auditor’s job is to flag the skipped step, not the symptom.
This CISA practice question tests your understanding of information systems acquisition, development and implementation. 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.
A nonprofit organization develops a small online donation platform using a third-party payment gateway. The project team skips formal security testing because of budget constraints. After launch, a security researcher discovers that the application fails to validate input on the donation amount field, allowing manipulation. The nonprofit loses several thousand dollars before the issue is patched. The IS auditor is asked to review the system development process. Which of the following is the PRIMARY finding?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
The donation amount field was not validated.
Why wrong: This is the vulnerability, not the root cause.
The organization lost money due to the exploit.
Why wrong: Impact, not process deficiency.
Security testing was not performed during development.
Testing would have identified the input validation issue.
The payment gateway was not properly integrated.
Why wrong: Integration was fine; the flaw was in the app.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Security testing was not performed during development.
Option C is correct because the primary finding for an IS auditor reviewing the system development process is the absence of security testing during development. Skipping formal security testing (e.g., static application security testing, dynamic application security testing, or penetration testing) violates the secure development lifecycle (SDLC) best practices and directly led to the input validation vulnerability. The IS auditor's focus is on process deficiencies, not the specific exploit or financial loss.
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.
The donation amount field was not validated.
Why it's wrong here
This is the vulnerability, not the root cause.
The organization lost money due to the exploit.
Why it's wrong here
Impact, not process deficiency.
Security testing was not performed during development.
Why this is correct
Testing would have identified the input validation issue.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
The payment gateway was not properly integrated.
Why it's wrong here
Integration was fine; the flaw was in the app.
Common exam traps
The trap here is that candidates focus on the immediate technical flaw (unvalidated input) or the financial loss, rather than recognizing that the IS auditor's role is to identify the systemic process failure (lack of security testing) that allowed the vulnerability to be introduced.
Detailed technical explanation
Input validation failures like the one described typically occur when the application does not enforce server-side validation (e.g., checking that the donation amount is a positive integer within an expected range) and relies solely on client-side JavaScript, which can be bypassed. In a secure development process, security testing should include fuzzing the donation amount field with negative numbers, zero, or extremely large values to ensure the backend rejects them. Real-world examples include the 'Penny Fraud' attack where attackers manipulate donation amounts to drain accounts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Information Systems Acquisition, Development and Implementation — This question tests Information Systems Acquisition, Development and Implementation — Read the scenario before looking for a memorised answer..
The correct answer is: Security testing was not performed during development. — Option C is correct because the primary finding for an IS auditor reviewing the system development process is the absence of security testing during development. Skipping formal security testing (e.g., static application security testing, dynamic application security testing, or penetration testing) violates the secure development lifecycle (SDLC) best practices and directly led to the input validation vulnerability. The IS auditor's focus is on process deficiencies, not the specific exploit or financial loss.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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