CVE-2025-23839

High

Published: 24 January 2025

Published

24 January 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 0.0013 32.1th percentile

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

Summary

CVE-2025-23839 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 32.1th 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-2025-23839 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Stored Cross-site Scripting (XSS) under CWE-79, in the Sticky Button WordPress plugin (sticky-chat-button) developed by Asif Shakeel. This issue affects all versions of the plugin from unknown initial release through 1.0 inclusive. The vulnerability was published on 2025-01-24.

The vulnerability carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), indicating network accessibility, low attack complexity, no required privileges, and user interaction needed for exploitation, with changed scope and low impacts to confidentiality, integrity, and availability. Attackers can submit malicious input through the plugin, which is stored and executed as JavaScript in the browser context of users viewing affected pages, such as site visitors interacting with the sticky chat button feature.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/sticky-chat-button/vulnerability/wordpress-sticky-button-plugin-1-0-cross-site-scripting-xss-vulnerability?_s_id=cve documents the Stored XSS vulnerability in Sticky Button plugin version 1.0 for WordPress. Security practitioners should review this reference for detailed analysis and recommended mitigations.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-3468

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Asif Shakeel Sticky Button sticky-chat-button allows Stored XSS.This issue affects Sticky Button: from n/a through <= 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 →

T1189 Drive-by Compromise Initial Access

Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.

attack.mitre.org →

Why these techniques?

Stored XSS in public-facing WordPress plugin directly enables T1190 Exploit Public-Facing Application for initial access via malicious input submission; facilitates T1189 Drive-by Compromise as stored JS executes in visitors' browsers upon page view.

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