CVE-2020-9281: 
JavaScript vulnerability analysis and mitigation

A cross-site scripting (XSS) vulnerability in the HTML Data Processor for CKEditor 4.0 before 4.14 allows remote attackers to inject arbitrary web script through a crafted "protected" comment (with the cke_protected syntax). The vulnerability was disclosed on March 6, 2020 (NVD).

The vulnerability has been assigned a CVSS v3.1 Base Score of 6.1 (Medium) with the following vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. The attack vector is network-based, with low attack complexity, requires no privileges, but does require user interaction. The scope is changed, with low impact on confidentiality and integrity, and no impact on availability (NVD).

If successfully exploited, this vulnerability allows attackers to inject malicious web scripts through specially crafted protected comments. This could lead to unauthorized access to sensitive information and potential manipulation of web content in the context of the user's session (NVD).

The primary mitigation is to upgrade CKEditor to version 4.14 or later. Various vendors have released patches for their products incorporating CKEditor, including Ubuntu which has released fixes in versions 4.12.1+dfsg-1ubuntu0.1 for 20.04 LTS and 4.5.7+dfsg-2ubuntu0.18.04.1 for 18.04 LTS (Ubuntu Security).