lxmlhtmlclean 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.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-116"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28350.json"
}