Bug 2444968 (CVE-2026-28348) - CVE-2026-28348 lxml_html_clean: lxml_html_clean: Cross-Site Scripting (XSS) via CSS filter bypass
Summary: CVE-2026-28348 lxml_html_clean: lxml_html_clean: Cross-Site Scripting (XSS) v...
Keywords:
Status: NEW
Alias: CVE-2026-28348
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2444970
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-05 21:02 UTC by OSIDB Bzimport
Modified: 2026-03-05 21:28 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-03-05 21:02:17 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.