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CVE-2026-28350

lxml_html_clean: <base> tag injection through default Cleaner configuration

Published: Mar 5, 2026Updated: Mar 6, 2026 Sources: CVE List NVD GHSA BDUCWE-116
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.3%
Top 83.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-116

Affected Products

lxml_html_cleanСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
Kaspersky Anti Targeted Attack PlatformАО «Лаборатория Касперского»Security Products
Kaspersky Endpoint Detection and ResponseАО «Лаборатория Касперского»Security Products
lxml_html_cleanfedora-python
Library
OSS Libraries / pypi
lxml-html-cleanPyPIOSS Libraries
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ао «лаборатория касперского»commercialRUSecurity Productsaka kaspersky, ao laboratoriya kasperskogo
fedora-pythonoss-projectOSS Librariesaka fedora-python
pypipackage-ecosystemOSS Libraries

Exploitability

Official Patch Available

References

https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-xvp8-3mhv-424c&#13;
github.com
https://github.com/fedora-python/lxml_html_clean/commit/9c5612ca33b941eec4178abf8a5294b103403f34&#13;
github.com
https://support.kaspersky.ru/vulnerability/list-of-advisories/12430#260526
support.kaspersky.ru
and 4 more references View all →

Timeline

Published
Mar 5, 2026
Last Updated
Mar 6, 2026

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