Ticket #15955: Remove_Special_Chars_from_filename__first_error_.patch

wp-includes/formatting.php

@@ -1772 +1772 @@
                  * @param string $filename     Sanitized filename.
                  * @param string $filename_raw The filename prior to sanitization.
                  */
-                return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
+                return apply_filters( 'sanitize_file_name', preg_replace( "/[^a-z0-9\-.]/", "", $filename ), $filename_raw );
         }
 
         // Process multiple extensions
@@ -1802 +1802 @@
         }
         $filename .= '.' . $extension;
         /** This filter is documented in wp-includes/formatting.php */
-        return apply_filters('sanitize_file_name', $filename, $filename_raw);
+        return apply_filters( 'sanitize_file_name', preg_replace( "/[^a-z0-9\-.]/", "", $filename ), $filename_raw );
 }
 
 /**