ThinkPHP Framework before 6.0.14 allows local file inclusion via the lang parameter when the language pack feature is enabled (lang_switch_on=true). An unauthenticated and remote attacker can exploit this to execute arbitrary operating system commands, as demonstrated by including pearcmd.php.
View the template here CVE-2022-47945.yaml
References:
https://github.com/top-think/framework/commit/c4acb8b4001b98a0078eda25840d33e295a7f099