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Home/Questions/Cloud/Tools/Explain how Access Control Lists (ACLs) can affect IAM role permissions.

Explain how Access Control Lists (ACLs) can affect IAM role permissions.

Cloud/Toolseasy0.2 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

Architectural logic: S3 has IAM and ACLs (legacy). Both must allow—ACLs can deny even if IAM allows. ACLs = per-object/bucket grants. IAM = identity-based. Trade-off: ACLs add complexity; prefer bucket policies + IAM....

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Asked at 1 company
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179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
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Expert Answer
43 words

Architectural logic: S3 has IAM and ACLs (legacy). Both must allow—ACLs can deny even if IAM allows. ACLs = per-object/bucket grants. IAM = identity-based. Trade-off: ACLs add complexity; prefer bucket policies + IAM. Best practice: Disable ACLs (BucketOwnerEnforced); use IAM for centralized control.

⚡
Pro Tip

Red Flag: Mixing ACLs and IAM without understanding evaluation order. Pro-Move: 'We disabled ACLs org-wide; BucketOwnerEnforced—IAM only, no ACL surprises.'

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