CISSP Identity and Access Management Practice Question
This CISSP practice question tests your understanding of identity and access management. 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 security engineer is troubleshooting an issue where users are unable to access a web application after being authenticated via OAuth 2.0. The users receive a 403 Forbidden error. The application logs show that the access token is valid but does not contain the required scope. What is the most likely cause?
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
✓
The authorization server did not grant the requested scope due to user consent settings.
The 403 Forbidden error indicates the resource server received a valid access token but denied access because the token lacks the necessary scope. In OAuth 2.0, the authorization server issues tokens based on the scope granted by the user during consent. If the user did not consent to the required scope (e.g., 'write' instead of 'read'), the token will not include it, causing the resource server to reject the request despite the token being valid.
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.
✗
The resource server is configured to expect a different token type.
Why it's wrong here
This would likely result in an unsupported token type error.
✗
The client application is not using HTTPS to transmit the token.
Why it's wrong here
This is a security concern but not directly causing 403.
✗
The access token expired before being presented to the resource server.
Why it's wrong here
Expired tokens typically result in 401 Unauthorized, not 403.
✓
The authorization server did not grant the requested scope due to user consent settings.
Why this is correct
The token lacks the required scope, so the resource server denies access.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing token validity (which is about signature, expiration, and issuer) with token authorization (which is about scope); candidates often assume a valid token guarantees access, but OAuth 2.0 separates authentication from authorization, and scope is the key authorization attribute.
Detailed technical explanation
How to think about this question
In OAuth 2.0 (RFC 6749), the 'scope' parameter is a space-delimited list of permissions requested by the client. The authorization server may reduce the scope based on user consent (e.g., via a consent screen where the user deselects permissions). The resulting access token encodes only the granted scopes, and the resource server (RFC 6750) checks these scopes before serving the resource. A real-world scenario is a third-party app requesting 'email' and 'profile' scopes but the user only consenting to 'email'; the token will lack 'profile', causing a 403 when accessing profile endpoints.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The authorization server did not grant the requested scope due to user consent settings. — The 403 Forbidden error indicates the resource server received a valid access token but denied access because the token lacks the necessary scope. In OAuth 2.0, the authorization server issues tokens based on the scope granted by the user during consent. If the user did not consent to the required scope (e.g., 'write' instead of 'read'), the token will not include it, causing the resource server to reject the request despite the token being valid.
What should I do if I get this CISSP 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.
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Question Discussion
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