CVE-2025-57520: 
JavaScript vulnerability analysis and mitigation

A Cross Site Scripting (XSS) vulnerability exists in Decap CMS through version 3.8.3. The vulnerability affects multiple input vectors including body, tags, title, and description fields which are not properly sanitized before being rendered in the content preview pane. This enables attackers to inject arbitrary JavaScript that executes whenever a user views the preview panel, without requiring additional user interaction beyond viewing the affected content (NVD).

The vulnerability is a stored XSS issue that affects the Admin Panel's Content Preview Renderer component. The flaw exists in how input fields such as title, tags, description, and body content are handled before being rendered in the preview pane. The vulnerability can be exploited under both contributor and editor roles, with the most severe impact occurring when an admin user views malicious content in preview mode (Security Blog).

The vulnerability allows arbitrary JavaScript execution in privileged user contexts when viewing the preview panel. This can lead to session hijacking, credential theft, content defacement, and potential injection of backdoors into statically generated websites. The impact is particularly severe when exploited against administrative users (Security Blog).

No official patches or mitigations have been publicly released yet as this is a recently disclosed vulnerability (NVD).