CVE-2025-48263: MultiVendorX Stored XSS Vulnerability

CVE-2025-48263 Overview

CVE-2025-48263 is a stored cross-site scripting (XSS) vulnerability in the MultiVendorX WordPress plugin (also known as dc-woocommerce-multi-vendor). The flaw affects all versions up to and including 4.2.22. An authenticated attacker with low privileges can inject malicious script content that persists in the application and executes in the browser of any user who views the affected page. The vulnerability is tracked under CWE-79 and was published on May 19, 2025.

Critical Impact
Authenticated attackers can store malicious JavaScript that executes in victims' browsers, enabling session theft, administrative action hijacking, and defacement of marketplace storefronts.

Affected Products

MultiVendorX (dc-woocommerce-multi-vendor) WordPress plugin versions up to and including 4.2.22
WordPress sites running WooCommerce with MultiVendorX multi-vendor marketplace functionality
Vendor dashboards and storefront pages rendered by the affected plugin

Discovery Timeline

2025-05-19 - CVE-2025-48263 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-48263

Vulnerability Analysis

The vulnerability stems from improper neutralization of user-supplied input during web page generation within the MultiVendorX plugin. Input submitted through vendor-accessible fields is stored in the WordPress database without adequate sanitization or output encoding. When another user, including administrators or shoppers, loads a page that renders the stored content, the browser interprets the attacker's payload as executable script.

The attack requires low privileges and user interaction, and the scope is changed, meaning the injected script can affect resources beyond the vulnerable component. In a marketplace context, this allows a malicious vendor to target site administrators or customers browsing storefronts. Confidentiality and integrity impacts are limited to information accessible to the victim's session, including cookies, authentication tokens, and DOM content.

Root Cause

The root cause is missing or insufficient input validation and output escaping in one or more vendor-facing input handlers of the dc-woocommerce-multi-vendor plugin. WordPress provides functions such as wp_kses(), esc_html(), and esc_attr() for context-appropriate escaping, but affected code paths did not apply them consistently to vendor-controlled data before persisting or rendering it.

Attack Vector

An attacker who holds a vendor-level account on the target WordPress installation submits a crafted payload containing JavaScript through an input field exposed by the plugin. The payload is persisted to the database. When an administrator or another user with higher privileges accesses the resulting page, the injected script executes in their authenticated session. Refer to the Patchstack XSS Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2025-48263

Indicators of Compromise

Vendor profile fields, product descriptions, or store settings containing <script>, onerror=, onload=, or javascript: strings
Unexpected outbound HTTP requests from administrator browsers to attacker-controlled domains after visiting vendor pages
New WordPress administrator accounts, altered user roles, or modified plugin settings following vendor activity
Database rows in wp_postmeta, wp_usermeta, or plugin-specific tables containing HTML event handlers inside vendor-submitted fields

Detection Strategies

Scan the WordPress database for HTML and JavaScript patterns within fields owned by vendor-role users
Review WooCommerce and MultiVendorX audit logs for recent vendor registrations followed by profile or product edits
Deploy a web application firewall rule that flags script tags and event handlers submitted to vendor-facing endpoints
Monitor browser Content Security Policy (CSP) violation reports originating from marketplace pages

Monitoring Recommendations

Alert on administrator session activity immediately following access to vendor-generated pages
Track plugin version inventory to confirm all MultiVendorX installations are above 4.2.22
Correlate WordPress authentication logs with changes to privileged accounts to identify session hijacking attempts

How to Mitigate CVE-2025-48263

Immediate Actions Required

Update the MultiVendorX plugin to a version later than 4.2.22 as published by the vendor
Audit all existing vendor-submitted content for stored script payloads and remove malicious entries
Rotate administrator credentials and invalidate active sessions if suspicious vendor activity is observed
Review vendor registration controls and disable self-service vendor signup if not required

Patch Information

Refer to the Patchstack advisory for MultiVendorX for the fixed version and remediation guidance. Apply the patched release through the WordPress plugin manager or by replacing plugin files from the official repository.

Workarounds

Restrict the vendor role to trusted users only until the plugin is updated
Deploy a Content Security Policy that disallows inline scripts on marketplace pages to reduce exploitability
Place a web application firewall in front of the WordPress site with rules blocking XSS payloads targeting vendor endpoints
Temporarily disable the MultiVendorX plugin if a patched version cannot be deployed promptly

bash

# Example WP-CLI commands to update and verify the MultiVendorX plugin
wp plugin update dc-woocommerce-multi-vendor
wp plugin get dc-woocommerce-multi-vendor --field=version

# Audit vendor-submitted content for script payloads
wp db query "SELECT ID, post_title FROM wp_posts \
  WHERE post_content REGEXP '<script|onerror=|onload=|javascript:' \
  AND post_author IN (SELECT ID FROM wp_users);"