How severe is CVE-2026-28348?

CVE-2026-28348 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-28348 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28348?

CVE-2026-28348 affects Fedoralovespython Lxml Html Clean. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28348?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-28348 have an EU (EUVD) identifier?

Yes. CVE-2026-28348 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9868.

When was CVE-2026-28348 published?

CVE-2026-28348 was published on 2026-03-05 and last updated on 2026-06-17.

CVE-2026-28348

CVE-2026-28348 is a medium-severity vulnerability in Fedoralovespython Lxml Html Clean with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-116.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9868
Weakness: CWE-116
Affected product: Fedoralovespython Lxml Html Clean
Published: 2026-03-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-28348?: CVE-2026-28348 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-28348 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28348?: CVE-2026-28348 affects Fedoralovespython Lxml Html Clean. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28348?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-28348 have an EU (EUVD) identifier?: Yes. CVE-2026-28348 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9868.
When was CVE-2026-28348 published?: CVE-2026-28348 was published on 2026-03-05 and last updated on 2026-06-17.

References

Affected products (1)

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

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