CVE-2025-66222

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

CVSS 9.7 CRITICALEPSS 0.5%CWE-94

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.7EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

ThinkInAIXYZ · deepchat

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

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