CVE-2025-66222

CriticalCVSS 9.6/10Last modified Oct 18, 2026

Description

DeepChat is a smart assistant uses artificial intelligence. In 0.5.0 and earlier, there is a Stored Cross-Site Scripting (XSS) vulnerability in the Mermaid diagram renderer allows an attacker to execute arbitrary JavaScript within the application context. By leveraging the exposed Electron IPC bridge, this XSS can be escalated to Remote Code Execution (RCE) by registering and starting a malicious MCP (Model Context Protocol) server.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-94 CWE-79

Affected software

No affected versions have been published.

Timeline

Published: Dec 3, 2025
Last modified: Oct 18, 2026
NVD status: Analyzed

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