# CVE-2025-63260: Syncfusion Essential Studio stored XSS in Document-Editor and Chat-UI

Source: https://junglewise.ai/threats/cve-2025-63260-syncfusion-essential-studio-stored-xss-in-document-editor-and  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-20. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-63260 · Severity: medium · CVSS 5.4 · Published 2026-03-20

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.

Vendors: [Syncfusion](https://junglewise.ai/threats/vendors/syncfusion).

## Quick answers

**Is CVE-2025-63260 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-63260 being exploited in the wild.

**How severe is CVE-2025-63260?** Medium severity, with a CVSS score of 5.4, published 20 March 2026.

**Which products and versions are affected?** Syncfusion Essential Studio 30.1.37.

**Is there a fix for CVE-2025-63260?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-63260 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-63260?** Check whether you run Syncfusion Essential Studio or Syncfusion at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## 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

## References

- [https://pentest-tools.com/PTT-2025-023-Multiple-Stored-XSS.pdf](https://pentest-tools.com/PTT-2025-023-Multiple-Stored-XSS.pdf)