Description

The application does not escape special characters before output to FE, lead to stored XSS.

Proof of Concept

1. Go to Content > Menus or Content Items.

2. Add an Item with the title set to XSS payload, e.g: Title"><svg/onload=prompt('xss_title');>

3. Save Draft or Publish > Go to View/Preview Draft. XSS will be triggered

Impact

XSS can have huge implications for a web application and its users. User accounts can be hijacked, change the html screen and insult the organization. Credentials could be stolen, sensitive data could be exfiltrated, and lastly, access to your client computers can be obtained.