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Vulnerability of lxml: Cross Site Scripting via HTML5 Formaction Attribute

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via HTML5 Formaction Attribute of lxml, in order to run JavaScript code in the context of the web site.
Impacted software: Debian, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 24/03/2021.
Références of this announce: CVE-2021-28957, DLA-2606-1, DSA-4880-1, USN-4896-1, USN-4896-2, VIGILANCE-VUL-34942.

Description of the vulnerability 

An attacker can trigger a Cross Site Scripting via HTML5 Formaction Attribute of...
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This weakness note impacts software or systems such as Debian, Ubuntu.

Our Vigil@nce team determined that the severity of this threat note 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 weakness.

Solutions for this threat 

Workarounds for this vulnerability are not yet public.
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