How to fix wordpress <=2.8.3 0day security bugs

From https://www.vul.kr/how-to-fix-wordpress

Line 188 to line 191 The original code is

$key = preg_replace('/[^a-z0-9]/i', '', $key);
if ( empty( $key ) )
return new WP_Error('invalid_key', __('Invalid key'));

Go to line 190,chang the code:

if ( empty( $key ) )
to

if ( empty( $key ) || is_array( $key ) )
so the fix code is(Line 188 to line 191)

$key = preg_replace('/[^a-z0-9]/i', '', $key);
if ( empty( $key ) || is_array( $key ) )
return new WP_Error('invalid_key', __('Invalid key'));