CVE-2025-66222

DeepChat Cross-Site Scripting(XSS) escalate to Remote Code Execution(RCE)

Published Dec 3, 2025 CVSS 3.1 · 9.7 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-79
CPEs cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Thinkinai
Thinkinai deepchat
Vendors & Products Thinkinai
Thinkinai deepchat
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title DeepChat Cross-Site Scripting(XSS) escalate to Remote Code Execution(RCE)
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 9.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 3, 2025, 7:10 PM
Reserved
Nov 24, 2025, 11:01 PM
Status
Analyzed
Published
Dec 3, 2025, 7:15 PM
Modified
Oct 18, 2026, 5:10 PM