CVE-2026-66606: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ThemeGrill SmartSMTP

This vulnerability (CWE-79) affects ThemeGrill SmartSMTP versions up to and including 1.2.0. It is an unauthenticated Cross-Site Scripting (XSS) issue where user input is not properly sanitized before being included in web pages. The CVSS 3.1 score is 7.1, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. No patch or remediation information is provided in the source data.

Successful exploitation can lead to execution of arbitrary scripts in the context of the victim's browser, potentially resulting in theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability. The vulnerability is exploitable without authentication but requires user interaction.

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 and educate users to avoid interacting with suspicious links or content related to the affected application.