diff --git a/.github/changelog/2463-from-description b/.github/changelog/2463-from-description
new file mode 100644
index 000000000..4728bdb4e
--- /dev/null
+++ b/.github/changelog/2463-from-description
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Disable REST API endpoints for internal post types.
diff --git a/includes/class-post-types.php b/includes/class-post-types.php
index 64f7af9d9..d834b2080 100644
--- a/includes/class-post-types.php
+++ b/includes/class-post-types.php
@@ -113,7 +113,7 @@ public static function register_inbox_post_type() {
 				),
 				'map_meta_cap'        => true,
 				'public'              => false,
-				'show_in_rest'        => true,
+				'show_in_rest'        => false,
 				'rewrite'             => false,
 				'query_var'           => false,
 				'supports'            => array( 'title', 'editor', 'author', 'custom-fields' ),
@@ -223,7 +223,7 @@ public static function register_outbox_post_type() {
 				),
 				'map_meta_cap'        => true,
 				'public'              => false,
-				'show_in_rest'        => true,
+				'show_in_rest'        => false,
 				'rewrite'             => false,
 				'query_var'           => false,
 				'supports'            => array( 'title', 'editor', 'author', 'custom-fields' ),
@@ -350,7 +350,7 @@ public static function register_post_post_type() {
 				),
 				'map_meta_cap'        => true,
 				'public'              => false,
-				'show_in_rest'        => true,
+				'show_in_rest'        => false,
 				'rewrite'             => false,
 				'query_var'           => false,
 				'supports'            => array( 'title', 'editor', 'author', 'custom-fields', 'excerpt', 'comments' ),