GHSA-w8gw-qm8p-j9j3 Craft Commerce has Stored XSS in Shipping Categories (Name & Description) Fields Leading to Potential Privilege Escalation

• Packagist craftcms/composer: >= 5.0.0-RC1, < 5.5.2 → fixed in 5.5.2 • Packagist craftcms/composer: >= 4.0.0-RC1, < 4.10.1 → fixed in 4.10.1

Summary A stored XSS vulnerability in Craft Commerce allows attackers to execute malicious JavaScript in an administrator’s browser. This occurs because the Shipping Categories (Name & Description) fields in the Store Management section are not properly sanitized before being displayed in the admin panel. --- Proof of Concept Requirments • General permissions: • Access the control panel • Access Craft Commerce • Craft Commerce permissions: • Manage store settings • Manage shipping • An active administrator elevated session Steps to Reproduce 1. Log in to the Admin Panel with the attacker account with the permissions mentioned above. 2. Navigate to Commerce -> Store Management -> Shipping Categories (`/admin/commerce/store-management/primary/shippingcategories`). 3. Create a new shipping category. 4. In the Name field, enter the following payload: ```html ``` 4. Click Save & Go back to the previous page. 5. Notice the alert proving JavaScript execution. Privilege Escalation to Administrator: 1. Do the same steps above, but replace the payload with a malicious one. 2. The following payload elevates the attacker’s account to Admin if there’s already an elevated session, replace the `` with your attacker id: ```html /permissions',{method:'POST',body:`CRAFT_CSRF_TOKEN=${Craft.csrfTokenValue}&userId=&admin=1&action=users/save-permissions`,headers:{'content-type':'application/x-www-form-urlencoded'}})"> ``` 3. In another browser, log in as an admin & go to the vulnerable page (shipping categories page). 4. Go back to your attacker account & notice you are now an admin. The privilege escalation requires an elevated session. In a real-world scenario, an attacker can automate the process by forcing a logout if the victim’s session is stale; upon re-authentication, the stored XSS payload executes within a fresh elevated session to complete the attack. Or even easier (and smarter), an attacker (using the XSS) can create a fake 'Session Expired' login modal overlay. Since it’s on the trusted domain, administrators will likely enter their credentials, sending them directly to the attacker. Resources: https://github.com/craftcms/commerce/commit/fa273330807807d05b564d37c88654cd772839ee