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AWS AWSCloudFormation documentation change

Service: AWSCloudFormation · 2025-07-04 · Documentation medium

File: AWSCloudFormation/latest/TemplateReference/aws-resource-fsx-filesystem.md

Summary

Clarified KMS key defaults and configuration requirements for different FileSystemType values

Security assessment

Added documentation about default FSx-managed KMS keys for encryption, which relates to security best practices for data protection. No evidence of addressing a specific security vulnerability, but enhances clarity on encryption configuration.

Diff

diff --git a/AWSCloudFormation/latest/TemplateReference/aws-resource-fsx-filesystem.md b/AWSCloudFormation/latest/TemplateReference/aws-resource-fsx-filesystem.md
index 3259f5106..073896b8e 100644
--- a//AWSCloudFormation/latest/TemplateReference/aws-resource-fsx-filesystem.md
+++ b//AWSCloudFormation/latest/TemplateReference/aws-resource-fsx-filesystem.md
@@ -152,0 +153,2 @@ The ID of the AWS Key Management Service (AWS KMS) key used to encrypt Amazon FS
+If this ID isn't specified, the Amazon FSx-managed key for your account is used. For more information, see [Encrypt](https://docs.aws.amazon.com/kms/latest/APIReference/API_Encrypt.html) in the _AWS Key Management Service API Reference_.
+
@@ -162 +164 @@ _Required_ : No
-The Lustre configuration for the file system being created.
+The Lustre configuration for the file system being created. This configuration is required if the `FileSystemType` is set to `LUSTRE`.
@@ -188 +190 @@ _Required_ : Conditional
-The ONTAP configuration properties of the FSx for ONTAP file system that you are creating.
+The ONTAP configuration properties of the FSx for ONTAP file system that you are creating. This configuration is required if the `FileSystemType` is set to `ONTAP`.
@@ -190 +192 @@ The ONTAP configuration properties of the FSx for ONTAP file system that you are
-_Required_ : No
+_Required_ : Conditional
@@ -199 +201 @@ _Required_ : No
-The Amazon FSx for OpenZFS configuration properties for the file system that you are creating.
+The Amazon FSx for OpenZFS configuration properties for the file system that you are creating. This configuration is required if the `FileSystemType` is set to `OPENZFS`.
@@ -201 +203 @@ The Amazon FSx for OpenZFS configuration properties for the file system that you
-_Required_ : No
+_Required_ : Conditional
@@ -322,3 +324 @@ _Required_ : No
-The configuration object for the Microsoft Windows file system you are creating.
-
-This value is required if `FileSystemType` is set to `WINDOWS`.
+The configuration object for the Microsoft Windows file system you are creating. This configuration is required if `FileSystemType` is set to `WINDOWS`.