The WP Mailster plugin for WordPress, developed by brandtoss, contains a reflected cross-site scripting vulnerability identified as CVE-2025-24598. This issue is due to improper input sanitization during web page generation, which enables attackers to inject and execute arbitrary scripts in the victim's browser. The vulnerability affects all versions up to 1.8.17.0. The CVSS 3.1 base score is 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability. No patch or vendor advisory is currently available to confirm remediation status.

Successful exploitation of this reflected XSS vulnerability could allow an attacker to execute arbitrary scripts in the context of a user's browser, potentially leading to information disclosure, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability. The CVSS score of 7.1 indicates a high-severity impact. However, there are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when interacting with untrusted inputs or links related to WP Mailster. Monitoring vendor channels for updates is recommended.