Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
fedora-python lxml_html_clean
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

lxml_html_clean是Fedora Python SIG开源的一个从 lxml.HTML.clean 复制的 HTML 清理功能的单独项目。 lxml_html_clean 0.4.4之前版本存在安全漏洞，该漏洞源于base标签通过默认Cleaner配置，可能导致攻击者注入该标签并劫持页面上的相对链接。

CVSS 6.1 · Medium EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-28350

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
lxml_html_clean: <base> tag injection through default Cleaner configuration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
lxml_html_clean 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lxml_html_clean是Fedora Python SIG开源的一个从 lxml.HTML.clean 复制的 HTML 清理功能的单独项目。 lxml_html_clean 0.4.4之前版本存在安全漏洞，该漏洞源于base标签通过默认Cleaner配置，可能导致攻击者注入该标签并劫持页面上的相对链接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fedora-python lxml_html_clean < 0.4.4 -

II. Public POCs for CVE-2026-28350

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-28350

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-28350 (1)

Vendor Advisories for CVE-2026-28350 (1)

IV. Related Vulnerabilities

Same product: lxml_html_clean
Same vendor: fedora-python
Same weakness: CWE-116