OWASP AntiSamy before 1.6.4 allows XSS via HTML attributes when using the HTML output serializer (XHTML is not affected). This was demonstrated by a javascript: URL with : as the replacement for the : character.
{
"nvd_published_at": "2021-07-19T15:15:00Z",
"cwe_ids": [
"CWE-79"
],
"severity": "MODERATE",
"github_reviewed_at": "2021-07-19T21:38:51Z",
"github_reviewed": true
}