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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-28348

CVE-2026-28348

MEDIUM6.1

lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes

Published Mar 5, 2026

Modified 1 weeks ago

Details

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.

References

https://github.com/fedora-python/lxml_html_clean/commit/2ef732667ddbc74ea59847bcf24b75809aaeed3b

https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-hw26-mmpg-fqfg

https://www.cve.org/CVERecord?id=CVE-2026-28348

CVSS Analysis

CVSS v3.1

6.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

ChangedS:C

Impact

Confidentiality

LowC:L

Integrity

LowI:L

Availability

NoneA:N

6.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

Input Validation

Improper Encoding/Escaping

Ecosystems

Timeline

PublishedMar 5, 2026

ModifiedMar 6, 2026

CVE-2026-28348 | Mondoo Vulnerability Intelligence