Executive brief
Syncfusion Essential Studio, a suite of software components used to build business applications, contains a security flaw in its document editing and chat interface tools. An attacker could inject malicious scripts into document comments or chat messages, which would then execute in the browser of other users viewing that content. This could lead to unauthorized actions being performed on behalf of users or the theft of sensitive session information.
Technical details
A stored Cross-Site Scripting (XSS) vulnerability exists in Syncfusion version 30.1.37. The flaw is located in the Document-Editor's 'reply to comment' field and the Chat-UI's chat message processing, where user-supplied input is improperly neutralized before being rendered in the web interface. An authenticated attacker can exploit this by submitting a specially crafted payload containing malicious JavaScript. When a victim views the affected comment or chat message, the script executes in the context of their browser session. This vulnerability is tracked as CWE-79 and requires low privileges and user interaction to succeed.
Affected products
- Syncfusion Syncfusion Essential Studio 30.1.37
Timeline
- 2026-03-20: disclosed
- 2026-03-20: advisory