CVE-2020-20269

Vulnerability

Caret Editor versions prior to 4.0.0-rc22 contain a vulnerability in the Markdown rendering engine that allows injection of arbitrary JavaScript code via a specially crafted Markdown document [3]. The issue was reported privately and affects all releases before the fix.

Exploitation

An attacker can craft a Markdown document containing malicious JavaScript and deliver it to a victim (e.g., via email, download, or shared file). When the victim opens the document in Caret Editor, the JavaScript executes in the context of the editor without requiring any additional user interaction beyond opening the file.

Impact

Successful exploitation allows arbitrary JavaScript execution within the Caret Editor application. Depending on the editor's capabilities and the user's system, this could lead to theft of sensitive data, file manipulation, or further compromise of the user's system.

Mitigation

The vulnerability is fixed in Caret Editor 4.0.0-rc22 [2]. Users should upgrade to this version or later. No workaround is available for earlier versions.