The answer is the missing permission is storage.objects.list. This permission is required for any operation that enumerates the objects within a Cloud Storage bucket, such as the `gsutil ls` command or a `GET /b/{bucket}/o` API call; without it, the API returns a 403 Forbidden error even if the principal holds broader bucket-level permissions like storage.buckets.get. On the Certified Cloud Security Professional CCSP exam, this scenario tests your understanding of granular IAM permissions versus predefined roles—a common trap is assuming that bucket-level access automatically grants object-level listing, when in fact storage.objectViewer or a custom role with storage.objects.list is necessary. A reliable memory tip is to think of the “list” permission as the key to the directory: you can open the bucket door (storage.buckets.get) but still cannot see what is inside the room without storage.objects.list.
CCSP Cloud Data Security Practice Question
This CCSP practice question tests your understanding of cloud data security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Refer to the exhibit.
$ gsutil ls gs://my-bucket/
AccessDeniedException: 403 my-service-account@project.iam.gserviceaccount.com does not have storage.objects.list access to the Google Cloud Storage bucket.
A DevOps engineer runs the above command and gets the error. What is the MOST likely missing permission?
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.
Refer to the exhibit.
$ gsutil ls gs://my-bucket/
AccessDeniedException: 403 my-service-account@project.iam.gserviceaccount.com does not have storage.objects.list access to the Google Cloud Storage bucket.
A
storage.buckets.get
Why wrong: That permission is for bucket metadata, not listing objects.
B
storage.buckets.list
Why wrong: That permission lists all buckets in a project, not objects.
C
storage.objects.get
Why wrong: Get permission is for retrieving individual objects, not listing.
D
storage.objects.list
List permission is required to list objects in a bucket.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
storage.objects.list
The command likely involves listing objects within a bucket (e.g., `gsutil ls` or an equivalent `GET /b/{bucket}/o` API call). The error indicates the principal lacks the `storage.objects.list` permission, which is required to enumerate objects in a bucket. Without this permission, the API returns a 403 Forbidden error even if the principal has other storage permissions.
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.
✗
storage.buckets.get
Why it's wrong here
That permission is for bucket metadata, not listing objects.
✗
storage.buckets.list
Why it's wrong here
That permission lists all buckets in a project, not objects.
✗
storage.objects.get
Why it's wrong here
Get permission is for retrieving individual objects, not listing.
✓
storage.objects.list
Why this is correct
List permission is required to list objects in a bucket.
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
ISC2 often tests the distinction between object-level permissions (like `storage.objects.get`) and bucket-level listing permissions (like `storage.objects.list`), trapping candidates who assume read access to objects implies the ability to list them.
Detailed technical explanation
How to think about this question
Under the hood, the Cloud Storage API uses the `storage.objects.list` permission to authorize the `GET /b/{bucket}/o` request, which returns a paginated list of object names. Without this permission, the server returns a 403 error regardless of whether the principal has `storage.objects.get` on individual objects. In real-world scenarios, a common misconfiguration is granting `storage.objectViewer` (which includes `storage.objects.get`) but forgetting `storage.legacyBucketReader` or `storage.objectViewer` does not include `storage.objects.list` for the bucket itself.
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.
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: storage.objects.list — The command likely involves listing objects within a bucket (e.g., `gsutil ls` or an equivalent `GET /b/{bucket}/o` API call). The error indicates the principal lacks the `storage.objects.list` permission, which is required to enumerate objects in a bucket. Without this permission, the API returns a 403 Forbidden error even if the principal has other storage permissions.
What should I do if I get this CCSP 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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