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Vulnerability record · CVE-2018-19787 · published 2 December 2018

CVE-2018-19787: Lxml cross-site scripting vulnerability

LLxml · Lxml

An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.

6.1 CVSS 3.1 Medium EPSS 2.4% · top 16.3% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109 PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
https://usn.ubuntu.com/3841-1/ Third Party Advisory
https://usn.ubuntu.com/3841-2/ Third Party Advisory
https://github.com/lxml/lxml/commit/6be1d081b49c97cfd7b3fbd934a193b668629109 PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00001.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00044.html
https://usn.ubuntu.com/3841-1/ Third Party Advisory
https://usn.ubuntu.com/3841-2/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-19787), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.