The problem: data filtering.

Error in version: 11.2 and below

Severity: high

To fix, open the file: /engine/go.php and find:

$url = @str_replace ( "&", "&", $url );

add below:

$url = htmlspecialchars( $url, ENT_QUOTES, $config['charset'] );
$url = str_replace ( "&", "&", $url );

Open the file:: /engine/ajax/typograf.php and find:

$txt = trim( convert_unicode( $_POST['txt'], $config['charset'] ) );

add below:

require_once ENGINE_DIR . '/classes/parse.class.php';
$parse = new ParseFilter();
$txt = $parse->process( $txt );
$txt = preg_replace( "/javascript:/i", "jаvascript:", $txt );
$txt = preg_replace( "/data:/i", "dаta:", $txt );