CVE-2025-46226: MPL-Publisher Stored XSS Vulnerability

CVE-2025-46226 Overview

CVE-2025-46226 is a stored Cross-Site Scripting (XSS) vulnerability in the ferranfg MPL-Publisher WordPress plugin. The flaw affects all versions from initial release through 2.18.0. Attackers with low-privilege authenticated access can inject malicious scripts that persist in the application and execute in the browsers of other users who view the affected pages. The vulnerability is classified under CWE-79 for improper neutralization of input during web page generation.

Critical Impact
Authenticated attackers can inject persistent JavaScript payloads that execute in administrator browsers, enabling session theft, unauthorized actions, and further compromise of the WordPress installation.

Affected Products

MPL-Publisher plugin for WordPress, all versions up to and including 2.18.0
WordPress sites with the mpl-publisher component installed and activated
Any downstream deployment bundling vulnerable versions of the plugin

Discovery Timeline

2025-04-22 - CVE CVE-2025-46226 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46226

Vulnerability Analysis

The vulnerability originates in how the MPL-Publisher plugin processes user-supplied input before rendering it into HTML output. The plugin fails to properly neutralize special characters that carry meaning in the browser rendering context. As a result, attacker-supplied HTML or JavaScript is stored server-side and later served to other users without adequate encoding or sanitization.

Stored XSS in a WordPress plugin context is significant because injected payloads persist in the database. Every subsequent page load that renders the affected field triggers execution of the payload. When the viewing user holds administrator privileges, the payload runs with full access to the WordPress admin session, allowing plugin installation, user creation, and content modification.

Exploitation requires an authenticated session with low privileges and a separate user interaction to trigger execution, which limits mass exploitation but does not prevent targeted abuse. The scope change indicator reflects that the injected script executes in a security context different from the vulnerable component.

Root Cause

The root cause is missing output encoding and insufficient input sanitization in the plugin's request handling paths. Input fields exposed to authenticated users are stored and later reflected into HTML without applying WordPress core sanitization functions such as esc_html(), esc_attr(), or wp_kses().

Attack Vector

An attacker with contributor-level or higher access submits crafted payloads containing HTML or JavaScript through plugin-exposed inputs. The payload is stored in the WordPress database. When an administrator or another authenticated user opens the affected view, the browser parses and executes the injected script in the context of the WordPress origin.

The vulnerability mechanism is documented in the Patchstack XSS Vulnerability Report. No public proof-of-concept exploit code has been released.

Detection Methods for CVE-2025-46226

Indicators of Compromise

Unexpected <script>, <svg>, <iframe>, or event handler attributes such as onerror= and onload= stored in wp_posts, wp_postmeta, or plugin-specific tables
Outbound HTTP requests from administrator browser sessions to unfamiliar domains shortly after opening plugin-managed content
New administrator accounts or unauthorized plugin installations following interaction with MPL-Publisher screens

Detection Strategies

Query the WordPress database for HTML tags and JavaScript event handlers stored in MPL-Publisher input fields
Deploy a Web Application Firewall (WAF) rule to flag requests to plugin endpoints containing script tags or JavaScript URIs
Correlate authenticated POST requests to /wp-admin/ MPL-Publisher endpoints with subsequent administrator activity in access logs

Monitoring Recommendations

Enable WordPress audit logging to track content changes performed by contributor and author roles
Monitor browser Content Security Policy (CSP) violation reports for inline script execution on WordPress admin pages
Alert on installation or modification of the MPL-Publisher plugin on production sites running versions at or below 2.18.0

How to Mitigate CVE-2025-46226

Immediate Actions Required

Identify all WordPress installations running the MPL-Publisher plugin at version 2.18.0 or earlier
Restrict contributor and author role assignments to trusted users while the plugin remains unpatched
Audit plugin-managed content for stored HTML or JavaScript payloads and remove any suspicious entries

Patch Information

At the time of publication, the advisory identifies affected versions as n/a through <= 2.18.0. Administrators should consult the Patchstack advisory and the plugin repository for the latest fixed release, and upgrade to a version above 2.18.0 once available.

Workarounds

Deactivate and remove the MPL-Publisher plugin until a patched version is installed
Enforce a strict Content Security Policy that disallows inline scripts on WordPress admin pages
Apply WAF virtual patching rules that block XSS payload patterns targeting MPL-Publisher request paths

bash

# Example WP-CLI commands to inventory and disable the vulnerable plugin
wp plugin list --name=mpl-publisher --fields=name,status,version
wp plugin deactivate mpl-publisher
wp plugin delete mpl-publisher