CVE-2019-14653

Vulnerability

Overview

CVE-2019-14653 is a cross-site scripting (XSS) vulnerability in pandao Editor.md version 1.5.0. The root cause is the lack of attribute filtering for the ` and HTML elements. This allows an attacker to inject malicious attributes such as onmouseover` into these elements [1].

Exploitation

An attacker can exploit this flaw by inserting a crafted payload into content processed by Editor.md. For example, using sup triggers JavaScript when the user hovers over the page [2]. No authentication or special privileges are required – merely the ability to submit data rendered by the editor.

Impact

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser. This can lead to session hijacking, data theft, or defacement of the affected web application.

Mitigation

As of the CVE publication, no patched version of Editor.md has been released. Users should apply input sanitization to strip event handler attributes from user-supplied content or consider alternative markdown editors.