Unauthenticated XSS in CleanTalk AntiSpam Firewall <= 6.82

Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability affecting Spam protection, AntiSpam, FireWall by CleanTalk plugin versions 6.82 and below. It allows attackers to inject malicious scripts into web pages viewed by users without requiring authentication.

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Detection Guidance

To detect this XSS vulnerability in Spam protection, AntiSpam, FireWall by CleanTalk <= 6.82, inspect web application inputs for unsanitized user-supplied data. Check for reflected or stored XSS by sending test payloads like <script>alert(1)</script> in form fields or URLs. Review server responses for script execution. Use tools like Burp Suite or OWASP ZAP to intercept and analyze traffic for malicious payloads.

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Impact Analysis

An attacker could exploit this to steal user sessions, deface websites, or deliver malware to visitors. Users with sensitive data on the site may face credential theft or unauthorized actions performed on their behalf.

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Compliance Impact

This XSS vulnerability could lead to data breaches, exposing personal or health data. Under GDPR, this may result in fines for insufficient technical safeguards. HIPAA-covered entities could face penalties for compromised protected health information due to inadequate security controls.

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Mitigation Strategies

Update the Spam protection, AntiSpam, FireWall by CleanTalk plugin to the latest version (6.82 or higher) to patch the XSS vulnerability.

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