CVE-2026-28350 — lxml_html_clean: <base> tag injection through default Cleaner configuration
lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configura…
Published: 2026-03-05 · CVSS: 6.1 · CVSS 3.1
lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7