CVE-2025-24559

High

Published: 03 February 2025

Published

03 February 2025

Modified

23 April 2026

KEV Added

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Patch

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CVSS Score 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS Score 0.0004 12.0th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-24559 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Wpmailster Wp Mailster. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-15 Information Output Filtering good match

prevent

Directly addresses reflected XSS by requiring output filtering to neutralize malicious scripts before rendering in victims' browsers.

SI-10 Information Input Validation good match

prevent

Prevents exploitation by validating and sanitizing user inputs to block improper neutralization during web page generation.

SI-2 Flaw Remediation good match

prevent

Ensures timely patching of the specific flaw in WP Mailster plugin versions through 1.8.15.0 to remediate the XSS vulnerability.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

Why these techniques?

Reflected XSS in public-facing WordPress plugin directly enables exploitation of web application and arbitrary JavaScript execution in victim's browser.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in brandtoss WP Mailster wp-mailster allows Reflected XSS.This issue affects WP Mailster: from n/a through <= 1.8.15.0.

Deeper analysisAI

CVE-2025-24559 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the WP Mailster WordPress plugin developed by brandtoss (wp-mailster). This issue affects the plugin from unspecified initial versions through 1.8.15.0.

The vulnerability can be exploited by a remote attacker requiring no privileges (PR:N), over the network (AV:N) with low complexity (AC:L), though it demands user interaction (UI:R), such as clicking a malicious link. Successful exploitation changes scope (S:C) and results in low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L), yielding a CVSS v3.1 base score of 7.1. Attackers could inject and execute arbitrary scripts in victims' browsers.

Patchstack's advisory (https://patchstack.com/database/Wordpress/Plugin/wp-mailster/vulnerability/wordpress-wp-mailster-plugin-1-8-15-0-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve) documents the Reflected XSS in WP Mailster 1.8.15.0 and covers mitigation details for affected WordPress installations.