CVE-2026-28350 MEDIUM

CVE-2026-28350: lxml_html_clean: <base> tag injection through default Cleaner configuration

Vendor Fedora-Python
Product lxml_html_clean
Weakness CWE-116
Published March 5, 2026
Last update March 6, 2026
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 5, 2026 CVE published
March 6, 2026 Record updated