Cyber Resilience

CVE-2025-23439

High

Published: 03 March 2025

Published
03 March 2025
Modified
23 April 2026
KEV Added
—
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 0.0023 46.2th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-23439 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 46.2th 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-2025-23439 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the TinyMCE Extended Config WordPress plugin by willshouse. The issue affects all versions of the tinymce-extended-config plugin from n/a through 0.1.0 inclusive. Published on 2025-03-03, it carries a CVSS v3.1 base score of 7.1 (High).

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), such as visiting a maliciously crafted URL. The changed scope (S:C) enables execution of arbitrary JavaScript in the victim's browser context, resulting in low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L). Potential outcomes include session hijacking, data theft, or phishing within the authenticated user's session.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/tinymce-extended-config/vulnerability/wordpress-tinymce-extended-config-plugin-0-1-0-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve details the vulnerability in the WordPress TinyMCE Extended Config plugin version 0.1.0 and provides guidance on mitigation.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in willshouse TinyMCE Extended Config tinymce-extended-config allows Reflected XSS.This issue affects TinyMCE Extended Config: from n/a through <= 0.1.0.

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 public-facing applications (T1190) and arbitrary JavaScript execution in browser via crafted URL (T1059.007).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2026-3231Shared CWE-79
CVE-2025-23481Shared CWE-79
CVE-2025-69302Shared CWE-79
CVE-2025-23734Shared CWE-79
CVE-2025-23571Shared CWE-79
CVE-2025-65110Shared CWE-79
CVE-2026-24948Shared CWE-79
CVE-2025-27352Shared CWE-79
CVE-2025-30349Shared CWE-79
CVE-2026-3876Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-15 Information Output Filtering good match
prevent

Filters output during web page generation to neutralize untrusted input and prevent reflected XSS script execution in the victim's browser.

SI-10 Information Input Validation good match
prevent

Validates incoming inputs to reject or sanitize malicious payloads before they are reflected in dynamically generated web pages by the TinyMCE plugin.

SI-2 Flaw Remediation good match
prevent

Ensures timely patching or removal of the vulnerable TinyMCE Extended Config plugin to remediate the specific XSS flaw.

References