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AWS AWSCloudFormation documentation change

Service: AWSCloudFormation · 2026-07-01 · Documentation low

File: AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets-create.md

Summary

Added note about expanded pre-deployment validation checks during change set creation and instructions for creating express mode change sets.

Security assessment

The change documents additional validation checks (quota limits, Recorder conflicts) which improve reliability but don't address security vulnerabilities. Express mode documentation focuses on deployment speed, not security features.

Diff

diff --git a/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets-create.md b/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets-create.md
index 2a9862d6a..1f7789165 100644
--- a//AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets-create.md
+++ b//AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets-create.md
@@ -136,0 +137,16 @@ You submit your changes as command options. You can specify new parameter values
+###### Note
+
+In addition to property syntax validation and resource name conflict detection, change set creation checks for service quota limits, Recorder conflicts, and ECR repository delete readiness. These checks operate in WARN mode – CloudFormation creates the change set successfully, but warnings indicate potential issues. We recommend that you address these issues before you execute the change set.
+
+###### Express mode
+
+To create a change set that uses express mode, add the `--deployment-config` parameter:
+    
+    
+    aws cloudformation create-change-set --stack-name MyStack \
+        --change-set-name MyExpressChangeSet \
+        --use-previous-template \
+        --deployment-config '{"mode": "EXPRESS"}'
+
+When you execute this change set, CloudFormation uses express mode, completing resource operations as soon as configuration is applied. For more information, see [Express mode](./cloudformation-express-mode.html).
+