CVE-2025-56514: 
JavaScript vulnerability analysis and mitigation

A Cross Site Scripting (XSS) vulnerability has been identified in Fiora chat application version 1.0.0, tracked as CVE-2025-56514. The vulnerability was discovered by Kaio Mendonca Pereira and affects the group avatar functionality of the application. This security flaw allows authenticated users to execute arbitrary JavaScript code in the context of other users' browsers (GitHub POC, Fiora App).

The vulnerability exists in multiple components of the Fiora chat application, including the backend group management routes (packages/server/src/routes/group.ts), frontend group avatar upload interface (packages/web/src/modules/Chat/GroupManagePanel.tsx), API service layer (packages/web/src/service.ts), and avatar rendering component (packages/web/src/components/Avatar.ts). The vulnerability specifically occurs when malicious SVG files containing embedded JavaScript are uploaded through the group avatar change functionality (GitHub POC).

When successfully exploited, this vulnerability allows attackers to execute arbitrary JavaScript code in the context of other users' browsers who view the malicious group avatar. This can lead to unauthorized actions, data theft, and potential account compromise of users viewing the compromised group (GitHub POC).

The vulnerability affects Fiora chat application version 1.0.0. Users are advised to upgrade to a newer version once available. In the meantime, administrators should consider implementing additional validation for uploaded SVG files and restricting SVG upload capabilities (Fiora App).