index.php?p=/dashboard/settings/branding in Vanilla 2.6.3 allows stored XSS.
https://github.com/hacky1997/CVE-2020-8825
https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-29670
http://packetstormsecurity.com/files/156281/Vanilla-Forum-2.6.3-Cross-Site-Scripting.html