CVE-2025-64203 HIGH

CVE-2025-64203: WordPress Mailster plugin < 4.1.14 - Cross Site Scripting (XSS) vulnerability

Vendor Everpress
Product Mailster
Weakness CWE-79 · XSS
Published December 18, 2025
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress Mailster mailster allows Reflected XSS.This issue affects Mailster: from n/a through < 4.1.14.

Explanation of Vulnerability in Simple Terms

02Summary

Mailster versions up to 4.1.14 contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into the application. An attacker can craft a malicious link or page that, when visited by a user, executes arbitrary JavaScript in the victim's browser. This can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim.

What an attacker can do

03Attacker Capabilities

Inject and execute malicious JavaScript in a user's browser to steal session data, credentials, or perform actions as that user.

Potential impact on your site

04Site Impact

Users visiting malicious links could have their sessions compromised or be tricked into performing unwanted actions on your site.

Conditions required to exploit

05Prerequisites

Attacker must trick a user into visiting a malicious link or page (user interaction required). No authentication needed.

Key dates

06Disclosure timeline

December 18, 2025 CVE published
April 28, 2026 Record updated