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AWS serverless-application-model documentation change

Service: serverless-application-model · 2026-04-22 · Documentation medium

File: serverless-application-model/latest/developerguide/sam-property-api-domainconfiguration.md

Summary

Added EndpointAccessMode property for custom domain names, required when using enhanced security policies prefixed with 'SecurityPolicy_'

Security assessment

This change introduces documentation for the EndpointAccessMode property which is required when using enhanced security policies. While this adds security-related documentation about TLS/SSL configuration requirements, there is no evidence it addresses a specific security vulnerability or incident.

Diff

diff --git a/serverless-application-model/latest/developerguide/sam-property-api-domainconfiguration.md b/serverless-application-model/latest/developerguide/sam-property-api-domainconfiguration.md
index 8eed227b4..ea08269c5 100644
--- a//serverless-application-model/latest/developerguide/sam-property-api-domainconfiguration.md
+++ b//serverless-application-model/latest/developerguide/sam-property-api-domainconfiguration.md
@@ -23,0 +24 @@ To declare this entity in your AWS Serverless Application Model (AWS SAM) templa
+      EndpointAccessMode: String
@@ -101,0 +103,13 @@ _CloudFormation compatibility_ : This property is unique to AWS SAM and doesn't
+`EndpointAccessMode`
+    
+
+The access mode for the custom domain name endpoint. Required when using enhanced security policies (those prefixed with `SecurityPolicy_`).
+
+_Valid values_ : `STRICT` or `BASIC`
+
+_Type_ : String
+
+_Required_ : Conditional
+
+_CloudFormation compatibility_ : This property is passed directly to the `[EndpointAccessMode](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-apigateway-domainname.html#cfn-apigateway-domainname-endpointaccessmode)` property of an `AWS::ApiGateway::DomainName` resource, or to [`AWS::ApiGateway::DomainNameV2`](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-apigateway-domainnamev2) when `EndpointConfiguration` is set to `PRIVATE`.
+