CVE-2025-26542

High

Published: 26 March 2025

Published

26 March 2025

Modified

23 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS Score 0.0011 29.9th percentile

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

Summary

CVE-2025-26542 is a high-severity Cross-site Scripting (CWE-79) vulnerability. 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 29.9th 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).

Deeper analysis

CVE-2025-26542 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the Zalo Live Chat WordPress plugin developed by Dang Ngoc Binh. The issue affects all versions of the zalo-live-chat plugin from n/a through 1.1.0 inclusive. Published on 2025-03-26, it carries a CVSS v3.1 base score of 7.1.

Attackers can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) but user interaction (UI:R), and it results in a changed scope (S:C) with low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L). A remote unauthenticated attacker could craft malicious input that, when reflected in a web page and interacted with by a user (such as via a phishing link), executes arbitrary JavaScript in the victim's browser context.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/zalo-live-chat/vulnerability/wordpress-zalo-live-chat-plugin-1-1-0-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-8175

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Dang Ngoc Binh Zalo Live Chat zalo-live-chat allows Reflected XSS.This issue affects Zalo Live Chat: from n/a through <= 1.1.0.

CWE(s): CWE-79

Related Threats

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 the web application (T1190) to execute arbitrary JavaScript in the browser (T1059.007) via crafted malicious links.

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