DedeCMS 5.7SP2 is susceptible to cross-site request forgery with a corresponding impact of arbitrary code execution because the partcode parameter in a tag_test_action.php request can specify a runphp field in conjunction with PHP code.
View the template here CVE-2018-7700.yaml
References:
https://laworigin.github.io/2018/03/07/CVE-2018-7700-dedecms%E5%90%8E%E5%8F%B0%E4%BB%BB%E6%84%8F%E4%BB%A3%E7%A0%81%E6%89%A7%E8%A1%8C/