CVE-2026-39768: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in CleanTalk Inc Security & Malware scan by CleanTalk

CVE-2026-39768 is an improper neutralization of input during web page generation (CWE-79) vulnerability in CleanTalk Inc's Security & Malware scan product. It allows unauthenticated attackers to perform Cross-Site Scripting (XSS) attacks by injecting malicious scripts into web pages generated by the affected product versions up to 2.189. The vulnerability has a CVSS 3.1 base score of 7.1 with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability. No vendor advisory or patch information is available at this time.

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to data disclosure, modification, or disruption of service. The CVSS vector indicates impacts on confidentiality, integrity, and availability, with a high severity rating.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider applying web application firewall (WAF) rules to detect and block XSS payloads targeting this product. Avoid exposing the vulnerable interface to untrusted users if possible.