diff --git a/wp-includes/class-wp-customize-nav-menus.php b/wp-includes/class-wp-customize-nav-menus.php
index df374b9865..ef152895a8 100644
--- a/wp-includes/class-wp-customize-nav-menus.php
+++ b/wp-includes/class-wp-customize-nav-menus.php
@@ -1356,7 +1356,7 @@ final class WP_Customize_Nav_Menus {
 			if ( ! $post_type_obj ) {
 				continue;
 			}
-			if ( ! current_user_can( $post_type_obj->cap->publish_posts ) || ! current_user_can( $post_type_obj->cap->edit_post, $post_id ) ) {
+			if ( ! current_user_can( $post_type_obj->cap->publish_posts ) || ! current_user_can( 'edit_post', $post_id ) ) {
 				continue;
 			}
 			$post_ids[] = $post->ID;
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index 475d273f4f..d30c6c0d90 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -109,17 +109,12 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 		}
 
 		// Attaching media to a post requires ability to edit said post.
-		if ( ! empty( $request['post'] ) ) {
-			$parent           = get_post( (int) $request['post'] );
-			$post_parent_type = get_post_type_object( $parent->post_type );
-
-			if ( ! current_user_can( $post_parent_type->cap->edit_post, $request['post'] ) ) {
-				return new WP_Error(
-					'rest_cannot_edit',
-					__( 'Sorry, you are not allowed to upload media to this post.' ),
-					array( 'status' => rest_authorization_required_code() )
-				);
-			}
+		if ( ! empty( $request['post'] ) && ! current_user_can( 'edit_post', (int) $request['post'] ) ) {
+			return new WP_Error(
+				'rest_cannot_edit',
+				__( 'Sorry, you are not allowed to upload media to this post.' ),
+				array( 'status' => rest_authorization_required_code() )
+			);
 		}
 
 		return true;
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
index 5cc85738ac..5378e3f276 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
@@ -160,9 +160,7 @@ class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
 			return $parent;
 		}
 
-		$parent_post_type_obj = get_post_type_object( $parent->post_type );
-
-		if ( ! current_user_can( $parent_post_type_obj->cap->edit_post, $parent->ID ) ) {
+		if ( ! current_user_can( 'edit_post', $parent->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_read',
 				__( 'Sorry, you are not allowed to view autosaves of this post.' ),
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
index 7dd8d36532..7d5237fb37 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php
@@ -28,9 +28,8 @@ class WP_REST_Blocks_Controller extends WP_REST_Posts_Controller {
 	 * @return bool Whether the block can be read.
 	 */
 	public function check_read_permission( $post ) {
-		// Ensure that the user is logged in and has the read_blocks capability.
-		$post_type = get_post_type_object( $post->post_type );
-		if ( ! current_user_can( $post_type->cap->read_post, $post->ID ) ) {
+		// By default the read_post capability is mapped to edit_posts.
+		if ( ! current_user_can( 'read_post', $post->ID ) ) {
 			return false;
 		}
 
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index f12082c3c0..da2457c85a 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -1774,7 +1774,7 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 		}
 
 		if ( post_password_required( $post ) ) {
-			$result = current_user_can( $post_type->cap->edit_post, $post->ID );
+			$result = current_user_can( 'edit_post', $post->ID );
 		} else {
 			$result = $posts_controller->check_read_permission( $post );
 		}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index d07006f762..ea0375e10d 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1479,7 +1479,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		}
 
 		// Is the post readable?
-		if ( 'publish' === $post->post_status || current_user_can( $post_type->cap->read_post, $post->ID ) ) {
+		if ( 'publish' === $post->post_status || current_user_can( 'read_post', $post->ID ) ) {
 			return true;
 		}
 
@@ -1522,7 +1522,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			return false;
 		}
 
-		return current_user_can( $post_type->cap->edit_post, $post->ID );
+		return current_user_can( 'edit_post', $post->ID );
 	}
 
 	/**
@@ -1558,7 +1558,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			return false;
 		}
 
-		return current_user_can( $post_type->cap->delete_post, $post->ID );
+		return current_user_can( 'delete_post', $post->ID );
 	}
 
 	/**
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
index cc1945ae9d..295a20f81c 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
@@ -169,9 +169,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 			return $parent;
 		}
 
-		$parent_post_type_obj = get_post_type_object( $parent->post_type );
-
-		if ( ! current_user_can( $parent_post_type_obj->cap->edit_post, $parent->ID ) ) {
+		if ( ! current_user_can( 'edit_post', $parent->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_read',
 				__( 'Sorry, you are not allowed to view revisions of this post.' ),
@@ -409,7 +407,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 
 		$parent_post_type = get_post_type_object( $parent->post_type );
 
-		if ( ! current_user_can( $parent_post_type->cap->delete_post, $parent->ID ) ) {
+		if ( ! current_user_can( 'delete_post', $parent->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_delete',
 				__( 'Sorry, you are not allowed to delete revisions of this post.' ),
@@ -427,9 +425,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 			return $response;
 		}
 
-		$post_type = get_post_type_object( 'revision' );
-
-		if ( ! current_user_can( $post_type->cap->delete_post, $revision->ID ) ) {
+		if ( ! current_user_can( 'delete_post', $revision->ID ) ) {
 			return new WP_Error(
 				'rest_cannot_delete',
 				__( 'Sorry, you are not allowed to delete this revision.' ),
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ae6b843524..aac595f517 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47849';
+$wp_version = '5.5-alpha-47850';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.