CVE-2026-57394 is a reflected Cross-site Scripting (XSS) vulnerability in Tribulant Software Newsletters (newsletters-lite) affecting versions up to and including 4.14. The vulnerability arises from improper neutralization of input during web page generation, which can lead to script injection. The CVSS 3.1 vector indicates the attack can be performed remotely over the network with low attack complexity, no privileges required, but requires user interaction. The vulnerability impacts confidentiality, integrity, and availability to a limited extent. No vendor advisory or patch information is currently available.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to information disclosure, session hijacking, or other client-side impacts. The CVSS score of 7.1 reflects a high severity with partial impact on confidentiality, integrity, and availability. However, no known exploits have been reported in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider applying web application firewall rules to detect and block reflected XSS attempts and avoid clicking on suspicious links that may trigger the vulnerability.