Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Mailster WP Mailster wp-mailster allows… (CVE-2026-111830)

CVE-2026-111830 describes a stored cross-site scripting (XSS) vulnerability in WP Mailster (wp-mailster) versions up to and including 1.9.1.0. The issue arises due to improper neutralization of input during web page generation, which enables attackers to inject and execute malicious scripts in the context of the affected web application. This vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability.

Successful exploitation of this stored XSS vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected application, potentially leading to information disclosure, modification of data, or disruption of service. The vulnerability affects confidentiality, integrity, and availability of the system as indicated by the CVSS vector.

No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution with input handling and consider applying any recommended temporary mitigations from the vendor.