An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.
{
"github_reviewed_at": "2022-06-28T23:26:59Z",
"cwe_ids": [
"CWE-79"
],
"nvd_published_at": "2018-12-02T10:29:00Z",
"github_reviewed": true,
"severity": "MODERATE"
}