CVE-2025-14039: Simple Folio WordPress XSS Vulnerability

CVE-2025-14039 Overview

The Simple Folio plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the _simple_folio_item_client_name and _simple_folio_item_link meta fields. This vulnerability exists in all versions up to and including 1.1.1 due to insufficient input sanitization and output escaping. Authenticated attackers with Contributor-level access or higher can inject arbitrary web scripts that execute whenever a user accesses an injected page.

Critical Impact

Attackers with low-privilege accounts can inject malicious scripts that persist in WordPress pages, potentially leading to session hijacking, credential theft, or malicious redirects affecting all visitors to compromised pages.

Affected Products

• WordPress Simple Folio plugin version 1.1.1 and earlier
• WordPress sites using Simple Folio for portfolio management
• Environments allowing Contributor-level or higher user accounts

Discovery Timeline

• 2026-01-28 - CVE CVE-2025-14039 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-14039

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability arises from improper handling of user-supplied data in the Simple Folio plugin's portfolio item functionality. The plugin fails to properly sanitize input data stored in the _simple_folio_item_client_name and _simple_folio_item_link custom meta fields, and subsequently does not escape this data when rendering it on the frontend.

When a user with Contributor-level permissions creates or edits a portfolio item, they can inject malicious JavaScript code into these meta fields. The malicious payload is stored in the WordPress database and rendered without proper escaping in the single-simple-folio.php template file. This means the injected script executes in the browser of any user who views the affected portfolio page, including administrators.

The vulnerability has a changed scope, meaning successful exploitation can impact resources beyond the vulnerable component itself. While the attack requires authentication (Contributor-level access), no user interaction is needed beyond viewing the compromised page.

Root Cause

The root cause of CVE-2025-14039 is the lack of proper input validation and output encoding in the Simple Folio plugin's template rendering code. Specifically, the vulnerable code at lines 70 and 76 of single-simple-folio.php outputs user-controlled meta field values directly into the HTML without applying WordPress's built-in escaping functions such as esc_html(), esc_attr(), or wp_kses().

This is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), a common vulnerability pattern where applications include untrusted data in web page output without sufficient sanitization.

Attack Vector

The attack is network-based and requires the attacker to have authenticated access with at least Contributor-level privileges. The exploitation flow involves:

1. The attacker logs into the WordPress site with Contributor or higher privileges
2. The attacker creates or edits a Simple Folio portfolio item
3. Malicious JavaScript is inserted into the _simple_folio_item_client_name or _simple_folio_item_link meta fields
4. When any user (including administrators) views the portfolio page, the malicious script executes in their browser context

The vulnerability allows attackers to steal session cookies, redirect users to malicious sites, modify page content, or perform actions on behalf of authenticated users.

Detection Methods for CVE-2025-14039

Indicators of Compromise

• Unexpected JavaScript code or HTML tags in portfolio item client name or link fields
• Suspicious <script> tags or event handlers (e.g., onerror, onload, onclick) stored in WordPress post meta tables
• Anomalous network requests originating from portfolio pages to external domains
• Reports of unexpected browser behavior or redirects when viewing portfolio items

Detection Strategies

• Review WordPress database for suspicious content in _simple_folio_item_client_name and _simple_folio_item_link meta values using SQL queries against wp_postmeta
• Implement Web Application Firewall (WAF) rules to detect XSS payloads in form submissions targeting the Simple Folio plugin
• Monitor WordPress audit logs for unusual portfolio item creation or modification by Contributor-level accounts
• Use browser developer tools to inspect portfolio page source for unauthorized inline scripts

Monitoring Recommendations

• Enable WordPress security plugins that log and alert on suspicious post meta changes
• Configure SentinelOne Singularity to monitor for JavaScript injection patterns in web application traffic
• Regularly audit user accounts with Contributor-level access and above for suspicious activity
• Implement Content Security Policy (CSP) headers to mitigate the impact of successful XSS exploitation

How to Mitigate CVE-2025-14039

Immediate Actions Required

• Update Simple Folio plugin to the latest patched version immediately
• Audit all existing portfolio items for malicious content in client name and link fields
• Review and restrict Contributor-level access to only trusted users
• Consider temporarily deactivating the Simple Folio plugin until a patch is applied

Patch Information

A security patch addressing this vulnerability has been released. The fix can be reviewed in the WordPress Simple Folio Changeset. The patch adds proper output escaping to the affected meta field values in the single-simple-folio.php template. Additional technical analysis is available from Wordfence Vulnerability Analysis.

Workarounds

• Manually add output escaping by wrapping meta field outputs with esc_html() or esc_attr() in the single-simple-folio.php template at lines 70 and 76
• Restrict the ability to create or edit portfolio items to Administrator-level users only until patched
• Implement server-side input validation to strip HTML/JavaScript from the affected meta fields
• Deploy a Web Application Firewall with rules specifically targeting XSS payloads in WordPress form submissions

# Configuration example
# Restrict portfolio post type capabilities in wp-config.php or theme functions.php
# Add to your theme's functions.php:
# function restrict_folio_caps($caps, $cap, $user_id, $args) {
#     if ($cap === 'edit_simple_folio' || $cap === 'publish_simple_folio') {
#         $caps[] = 'manage_options'; // Require admin capability
#     }
#     return $caps;
# }
# add_filter('map_meta_cap', 'restrict_folio_caps', 10, 4);