Reduce alert noise: Security Hub HIGH/CRITICAL only#41
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MEDIUM findings (SSL, logging, required-tags) are too noisy and duplicate what the compliance reporter already covers. A single S3 bucket create/delete generated 4 MEDIUM Security Hub alerts on top of the resource creation and compliance alerts.
Terraform PlanChanges detected — review required. Plan output |
LLM Plan ReviewRisk: 🟢 LOW Updating Security Hub findings filter to route only HIGH and above severity alerts instead of MEDIUM and above to SNS.
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Alexanderamiri
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May 9, 2026
## Summary Filter Security Hub EventBridge rule from MEDIUM+ to HIGH/CRITICAL only. A single S3 bucket create/delete was generating 6 Slack alerts: 1. Resource Created (useful) 2. Untagged Resource — Config rule (useful) 3. Resource Deleted (useful) 4. Security Hub: required-tags MEDIUM (duplicate of #2) 5. Security Hub: SSL not required MEDIUM (noise) 6. Security Hub: access logging not enabled MEDIUM (noise) After this change: alerts 4-6 are suppressed. Config + compliance reporter already cover tagging. ## Future work - Batch alerts into 5-minute windows - Deduplicate Config vs Security Hub findings - S3 account-wide defaults for access logging
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Summary
Filter Security Hub EventBridge rule from MEDIUM+ to HIGH/CRITICAL only.
A single S3 bucket create/delete was generating 6 Slack alerts:
After this change: alerts 4-6 are suppressed. Config + compliance reporter already cover tagging.
Future work