Can't select membership level issue in product edit page has fixed.

wp-express-checkout/includes/class-utils.php

@@ -793,6 +793,61 @@ public static function wpec_load_template( $template, $args = array(), $load_onc
 		return $tpl_html;
 	}
 
+	public static function wp_kses_common_attributes() {
+		$common_attributes = array(
+			'id'       => true,
+			'class'    => true,
+			'style'    => true,
+			'title'    => true,
+			'disabled' => true,
+			'aria-*'   => true,
+			'data-*'   => true,
+		);
+		return apply_filters( 'wpec_kses_common_attributes', $common_attributes );
+	}
+
+	public static function wp_kses_select_option_tags(){
+
+		$common_attributes = self::wp_kses_common_attributes();
+
+		$allowed_tags = array(
+			'option' => array_merge( $common_attributes, array(
+				'value'    => true,
+				'label'    => true,
+				'selected' => true,
+			) ),
+
+			'optgroup' => array_merge( $common_attributes, array(
+				'label' => true,
+			) ),
+		);
+
+		return apply_filters( 'wpec_kses_select_option_tags', $allowed_tags );
+	}
+
+	/**
+	 * Returns allowed select field tags and attributes for wp_kses().
+	 *
+	 * @return array Allowed HTML tags and attributes.
+	 */
+	public static function wp_kses_select_tags() {
+		$allowed_tags = array(
+			'select' => array_merge( self::wp_kses_common_attributes(), array(
+				'name'         => true,
+				'multiple'     => true,
+				'required'     => true,
+				'size'         => true,
+				'form'         => true,
+				'autocomplete' => true,
+				'autofocus'    => true,
+				'tabindex'     => true,
+			) ),
+		);
+		$allowed_tags = array_merge( $allowed_tags, self::wp_kses_select_option_tags() );
+
+		return apply_filters( 'wpec_kses_select_tags', $allowed_tags );
+	}
+
 	public static function wp_kses_post_tags_with_form() {
 		// Array of common standard and custom form attributes
 		$all_attributes = array(

wp-express-checkout/includes/integrations/simple-wp-membership/class-simple-wp-membership.php

@@ -4,6 +4,7 @@
 
 use WP_Express_Checkout\Debug\Logger;
 use WP_Express_Checkout\Products;
+use WP_Express_Checkout\Utils;
 
 class Simple_WP_Membership extends Emember {
 
@@ -40,13 +41,13 @@ public function add_meta_boxes() {
 	public function display_meta_box( $post ) {
 		$current_val = get_post_meta( $post->ID, 'wpec_product_swpm_level', true );
 		?>
-<p><?php esc_html_e( 'If you want this product to be connected to a membership level then select the membership Level here.', 'wp-express-checkout' ); ?></p>
-<select name="wpec_product_swpm_level">
-<option value=""><?php esc_html_e( 'None', 'wp-express-checkout' ); ?></option>
-		<?php
-		echo wp_kses_post( \SwpmUtils::membership_level_dropdown( $current_val ) );
-		?>
-</select>
+		<p>
+			<?php esc_html_e( 'If you want this product to be connected to a membership level then select the membership Level here.', 'wp-express-checkout' ); ?>
+		</p>
+		<select name="wpec_product_swpm_level">
+			<option value=""><?php esc_html_e( 'None', 'wp-express-checkout' ); ?></option>
+			<?php echo wp_kses( \SwpmUtils::membership_level_dropdown( $current_val ), Utils::wp_kses_select_tags() ); ?>
+		</select>
 		<?php
 	}
 

wp-express-checkout/readme.txt

@@ -175,6 +175,8 @@ https://wp-express-checkout.com/
 None
 
 == Changelog ==
+= WIP =
+* Can't select membership level issue in product edit page has fixed.
 
 = 2.5.2 =
 * Improved the wpdb prepare statement in the function get_blog_ids().