Recently, the article pages and article-related attachment pages of our journals located in the OJS system are inaccessible. Through investigation, we found that the files_dir path in the configuration file config.inc.php was modified, but we checked the system log and there was no relevant record. We confirmed that the operation was not performed by our own engineers, and the server hosting provider did not receive any record of being attacked. This is obviously abnormal. Are there other factors causing this problem?