A blind SQL injection vulnerability exists in Xbtit 3.1 via the sid parameter in ajaxchat/getHistoryChatData.php file that is accessible by a registered user. As a result, a malicious user can extract sensitive data such as usernames and passwords and in some cases use this vulnerability in order to get a remote code execution on the remote web server.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-45821
• https://github.com/btiteam/xbtit-3.1/issues/6
• https://emaragkos.gr/infosec-adventures/xbtit-3-1-sql-njection/
• https://github.com/btiteam/xbtit-3.1/blob/master/ajaxchat/getHistoryChatData.php