Ticket #46124: 46124.patch

src/wp-includes/theme.php

@@ -1081 +1081 @@
 
         $width  = absint( $header->width );
         $height = absint( $header->height );
+        $alt = get_post_meta( $header->attachment_id, '_wp_attachment_image_alt', true );
 
         $attr = wp_parse_args(
                 $attr,
@@ -1088 +1089 @@
                         'src'    => $header->url,
                         'width'  => $width,
                         'height' => $height,
-                        'alt'    => get_bloginfo( 'name' ),
+                        'alt'    => $alt,
                 )
         );