DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to version 0.5.3, a security vulnerability exists in the Mermaid diagram rendering component that allows arbitrary JavaScript execution. Due to the exposure of the Electron IPC renderer to the DOM, this Cross-Site Scripting (XSS) flaw escalates to full Remote Code Execution (RCE), allowing an attacker to execute arbitrary system commands. Two concurrent issues, unsafe Mermaid configuration and an exposed IPC interface, cause this issue. Version 0.5.3 contains a patch.
The vulnerability results from two coexisting issues: unsafe configuration of the Mermaid library and exposed IPC (Inter-Process Communication) interface of the Electron application in the DOM context. An attacker can inject malicious JavaScript code through the vulnerable Mermaid diagram rendering component (CWE-94 — code injection). Since the Electron IPC renderer is directly accessible from the DOM level, the injected script can communicate with the application's main process and execute arbitrary system commands without proper isolation.
An attacker can gain full control over the victim's system by executing arbitrary system commands — resulting in complete compromise of confidentiality, integrity and availability of the system (C:H/I:H/A:H).
DeepChat should be updated to version 0.5.3, which contains a patch addressing both causes of the vulnerability (safe Mermaid configuration and limited exposure of the IPC interface). Details available in vendor references on GitHub.
Thinkinai DeepChat in versions before 0.5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HThinkinai Deepchat
APPThinkinai< 0.5.3
Related vulnerabilities
XSS i RCE w Thinkinai DeepChat przez nieskuteczną sanityzację Mermaid
Stored XSS eskalowany do RCE w DeepChat poprzez renderer Mermaid
RCE przez XSS w komponencie Mermaid w aplikacji DeepChat
RCE jednym kliknięciem w DeepChat przez niebezpieczny handler URL