CVE-2025-66222

critical · 9.6

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.

9.6

CVSS

0.6%

EPSS (exploit prob.)

48th

EPSS percentile

2025-12-03

Published

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

Weaknesses

CWE-94CWE-79

Affected products

Vendor	Product	Affected versions
thinkinai	deepchat	<= 0.5.0

Check a specific version with /api/v1/cve/match.

References

https://github.com/ThinkInAIXYZ/deepchat/commit/371ca7b42e3685aee6e3f0c61e85277ed1ff4db7
https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-v8v5-c872-mf8r

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-66222