CVE-2026-28348: medium-severity vulnerability in fedora-python lxml_html_clean
lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.3%
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
fedora-python · lxml_html_cleanRelated CVEs — fedora-python lxml_html_clean
In the same product, most dangerous first.
CVE-2024-52595HIGHHTML Cleaner allows crafted scripts in special contexts like svg or math to pass throughEPSS 0.5%CVE-2026-49825HIGHlxml: javascript: URL bypass in Cleaner via xlink:hrefEPSS 0.3%CVE-2026-28350MEDIUMlxml_html_clean: <base> tag injection through default Cleaner configurationEPSS 0.3%