We've tagged Yii2 debug extension version 2.1.27. It fixes a bug of unnecessary usage of backticks in UserPanel resulting in inability to work with environments where shell_exec is not available. No security was affected.

It seems, we've also forgot to write about 2.1.26:

• Backtrace for internal PHP functions was added.
• Module::$toolbarPosition was added to configure toolbar position.
• yii\debug\Module::$authManager was added to select RBAC manager used by UserPanel (default is authManager).