This vulnerability in EverPress Mailster is a reflected Cross-site Scripting (XSS) flaw caused by improper input neutralization during web page generation. It affects versions before 4.1.14 and can be triggered without privileges, requiring user interaction. The CVSS 3.1 base 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 vendor advisory information is provided in the data.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to information disclosure, modification of data, or disruption of service. The reflected nature means the attack requires the victim to interact with a crafted link or input. The vulnerability affects confidentiality, integrity, and availability to a limited extent as indicated by the CVSS vector.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution with untrusted inputs and links related to Mailster. Monitor vendor channels for updates and apply patches promptly once released.