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CVE-2014-3146

MediumPublished

Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5 allows remote attackers to conduct cross-site scripting (XSS) attacks...

Published: May 14, 2014
Updated: Dec 17, 2025
Assigning CNA: redhat
Evidence observed: Apr 15, 2014

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

6.3%

Low · next 30 days

Percentile: 93.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5 allows remote attackers to conduct cross-site scripting (XSS) attacks via control characters in the link scheme to the clean_html function.

Sources

lxml - 'clean_html' Security BypassExploit
Maksim Kochkin · linux · Apr 15, 2014

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