It was possible to exploit an Unauthenticated Time-Based Blind SQL Injection vulnerability in the Spam protection, AntiSpam, FireWall by CleanTalk WordPress Plugin before 5.153.4. The updatelog function in lib/Cleantalk/ApbctWP/Firewall/SFW.php included a vulnerable query that could be injected via the User-Agent Header by manipulating the cookies set by the Spam protection, AntiSpam, FireWall by CleanTalk WordPress plugin before 5.153.4, sending an initial request to obtain a ctsfwpasskey cookie and then manually setting a separate ctsfwpassed cookie and disallowing it from being reset.

The Spam protection, AntiSpam, FireWall by CleanTalk WordPress plugin before 5.185.1 does not validate ids before using them in a SQL statement, which could lead to SQL injection exploitable by high privilege users such as admin

The CleanTalk cleantalk-spam-protect plugin before 5.127.4 for WordPress is affected by: Cross Site Scripting (XSS). The impact is: Allows an attacker to execute arbitrary HTML and JavaScript code via the from or till parameter. The component is: inc/cleantalk-users.php and inc/cleantalk-comments.php. The attack vector is: When the Administrator is logged in, a reflected XSS may execute upon a click on a malicious URL.

The CleanTalk AntiSpam plugin <= 5.173 for WordPress is vulnerable to Reflected Cross-Site Scripting (XSS) via the $REQUEST['page'] parameter in/lib/Cleantalk/ApbctWP/FindSpam/ListTable/Comments.php

The CleanTalk AntiSpam plugin <= 5.173 for WordPress is vulnerable to Reflected Cross-Site Scripting (XSS) via the $REQUEST['page'] parameter in/lib/Cleantalk/ApbctWP/FindSpam/ListTable/Users.php