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Vulnerability of LXML: Cross Site Scripting via escape

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via escapes of LXML, in order to run JavaScript code in the context of the web site.
Vulnerable software: Debian, Fedora, Solaris, Ubuntu.
Severity of this announce: 2/4.
Creation date: 27/11/2020.
Références of this computer vulnerability: CVE-2020-27783, DLA-2467-1, DLA-2467-2, DSA-4810-1, DSA-4810-2, FEDORA-2020-0e055ea503, FEDORA-2020-307946cfb6, USN-4666-1, USN-4666-2, VIGILANCE-VUL-33985.

Description of the vulnerability 

An attacker can trigger a Cross Site Scripting via escapes of LXML, in order to run JavaScript code in the context of the web site.
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This vulnerability note impacts software or systems such as Debian, Fedora, Solaris, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer threat note.

Solutions for this threat 

Debian 10: new lxml packages.
New packages are available:
  Debian 10: lxml 4.3.2-1+deb10u2

Debian 9: new lxml packages.
New packages are available:
  Debian 9: lxml 3.7.1-1+deb9u3

Fedora 32-33: new python-lxml packages.
New packages are available:
  Fedora 32: python-lxml 4.4.1-5.fc32
  Fedora 33: python-lxml 4.5.1-3.fc33

Oracle Solaris: patch for third party software of January 2021 v4.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Ubuntu: new lxml packages.
New packages are available:
  Ubuntu 20.10: python3-lxml 4.5.2-1ubuntu0.3
  Ubuntu 20.04 LTS: python-lxml 4.5.0-1ubuntu0.2, python3-lxml 4.5.0-1ubuntu0.2
  Ubuntu 18.04 LTS: python-lxml 4.2.1-1ubuntu0.3, python3-lxml 4.2.1-1ubuntu0.3
  Ubuntu 16.04 LTS: python-lxml 3.5.0-1ubuntu0.3, python3-lxml 3.5.0-1ubuntu0.3
  Ubuntu 14.04 ESM: python-lxml 3.3.3-1ubuntu0.2+esm2, python3-lxml 3.3.3-1ubuntu0.2+esm2
  Ubuntu 12.04 ESM: python-lxml 2.3.2-1ubuntu0.5, python3-lxml 2.3.2-1ubuntu0.5
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