rails-html-sanitizer >= 1.0.3, < 1.4.4
is vulnerable to cross-site scripting via data URIs when used in combination with Loofah >= 2.1.0
.
Upgrade to rails-html-sanitizer >= 1.4.4
.
The maintainers have evaluated this as Medium Severity 6.1.
This vulnerability was independently reported by Maciej Piechota (@haqpl) and Mrinmoy Das (@goromlagche).