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AWS AWSCloudFormation medium security documentation change

Service: AWSCloudFormation · 2025-11-07 · Security-related medium

File: AWSCloudFormation/latest/TemplateReference/aws-resource-opensearchserverless-collection.md

Summary

Added KmsKeyArn property for encryption and changed update policy to Replacement

Security assessment

Introducing KMS key configuration explicitly enables encryption-at-rest, a critical security feature. The update policy change to 'Replacement' ensures encryption settings cannot be modified in-place, enforcing security controls.

Diff

diff --git a/AWSCloudFormation/latest/TemplateReference/aws-resource-opensearchserverless-collection.md b/AWSCloudFormation/latest/TemplateReference/aws-resource-opensearchserverless-collection.md
index 7b0f40ee7..f00d79ca8 100644
--- a//AWSCloudFormation/latest/TemplateReference/aws-resource-opensearchserverless-collection.md
+++ b//AWSCloudFormation/latest/TemplateReference/aws-resource-opensearchserverless-collection.md
@@ -103 +103 @@ _Required_ : No
- _Update requires_ : [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
+ _Update requires_ : [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
@@ -166,0 +167,5 @@ A unique identifier for the collection. For example, `07tjusf2h91cunochc`.
+`KmsKeyArn`
+    
+
+The ARN of the AWS KMS key used to encrypt the collection.
+