CVE-2025-66222
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-03

Last updated on: 2025-12-05

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2025-12-03
Last Modified
2025-12-05
Generated
2026-06-16
AI Q&A
2025-12-03
EPSS Evaluated
2026-06-15
NVD
CVE-2025-66222
EUVD
EUVD-2025-201091
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
thinkinai deepchat to 0.5.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Mermaid diagram renderer used by DeepChat version 0.5.0 and earlier. An attacker can inject malicious JavaScript code that executes within the application's context. Furthermore, by exploiting the exposed Electron IPC bridge, the attacker can escalate this XSS vulnerability to Remote Code Execution (RCE) by registering and starting a malicious Model Context Protocol (MCP) server.

Impact Analysis

This vulnerability can have severe impacts including unauthorized execution of arbitrary JavaScript code within the application, which can lead to data theft, session hijacking, or other malicious actions. Additionally, the escalation to Remote Code Execution (RCE) allows an attacker to execute arbitrary code on the host system, potentially leading to full system compromise, data loss, or further attacks within the environment.

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