CVE-2020-19698

Root

Cause Pandao Editor.md v1.5.0 is vulnerable to stored cross-site scripting (XSS) due to insufficient sanitization of user input in the editor parameter. The application fails to filter or escape malicious HTML tags, allowing the injection of arbitrary scripts [1][2][4].

Exploitation

An attacker can craft a payload containing ` tags or other XSS vectors and inject it via the editor parameter. No authentication is required, and the attack can be triggered when a victim views the rendered markdown content [2][4]. Proof-of-concept exploits include using a ` tag to load external libraries and executing arbitrary JavaScript, such as redirecting to a malicious site [4].

Impact

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser. This can lead to session hijacking, sensitive data theft, defacement, or redirection to malicious websites [4].

Mitigation

The vulnerability has been addressed in a security fix merged via pull request #860, which disables script and event handlers by default. Users should upgrade to a patched version or apply the recommended changes [3].