XSS can be triggered via the Update Asset Index utility
XSS will be triggered
Json response volumes name makes triggers the payload
"session":{"id":1,"indexedVolumes":{"1":"\"<script>alert(26)</script>"},
It’s run on every POST request in the utility.
Resolved in https://github.com/craftcms/cms/commit/8c2ad0bd313015b8ee42326af2848ee748f1d766