CVE-2026-28348

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/fedora-python/lxml_html_clean/commit/2ef732667ddbc74ea59847bcf24b75809aaeed3b	Patch
https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-hw26-mmpg-fqfg	Exploit Vendor Advisory
https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-hw26-mmpg-fqfg	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:fedoralovespython:lxml_html_clean:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-03-05 20:16

Updated : 2026-03-09 20:55

NVD link : CVE-2026-28348

Mitre link : CVE-2026-28348

CVE.ORG link : CVE-2026-28348

JSON object : View

Products Affected

fedoralovespython

lxml_html_clean

CWE

CWE-116

Improper Encoding or Escaping of Output

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