CVE-2019-19935: 
JavaScript vulnerability analysis and mitigation

Froala Editor before version 3.2.3 contains a Cross-Site Scripting (XSS) vulnerability. The vulnerability was discovered in December 2019 and was assigned CVE-2019-19935. The issue affects all versions of the Froala WYSIWYG HTML Editor up to version 3.2.3, which is a widely used JavaScript-based rich text editor for web applications (Compass Advisory, NVD).

The vulnerability is a DOM-based Cross-Site Scripting (XSS) issue where HTML code in the editor is not correctly sanitized when inserted into the DOM. The vulnerability can be exploited by inserting an iframe tag with the srcdoc attribute into the editor. The CVSS v3.1 Base Score is 6.1 (Medium) with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N (Compass Advisory).

An attacker who can control the editor content can execute arbitrary JavaScript code in the context of the victim's session. This can be exploited to read the content of the victim's account, use the session to make further requests to the web application, or access cookies and web storage (Compass Advisory).

The vulnerability was fixed in Froala Editor version 3.2.3. Until the fixed version can be implemented, it is recommended to only load trusted data or data that is already sanitized into the editor (Compass Advisory).

The vulnerability disclosure process took over 200 days from initial discovery to public disclosure. During this period, there was significant communication between the researchers and Froala, with the vendor initially confirming the vulnerability but later showing inconsistent responses about its existence (Compass Blog).