If you have explicitly allowed the <style> tag, an attacker could craft HTML that includes script after passing through the sanitizer. The default settings disallow the <style> tag so there is no risk if you have not explicitly allowed the <style> tag.
The problem has been fixed in version 5.0.372.
Remove the <style> tag from the set of allowed tags.
If you have any questions or comments about this advisory open an issue in https://github.com/mganss/HtmlSanitizer
This issue was discovered by Michal Bentkowski of Securitum.
{
"github_reviewed": true,
"nvd_published_at": "2021-01-04T19:15:00Z",
"github_reviewed_at": "2021-01-04T18:21:52Z",
"severity": "LOW",
"cwe_ids": [
"CWE-74",
"CWE-79"
]
}