CVE-2025-66222 is a critical stored Cross-Site Scripting (XSS) vulnerability affecting DeepChat versions 0.5.0 and earlier, specifically within its Mermaid diagram renderer. This XSS can be escalated to Remote Code Execution (RCE) by exploiting an exposed Electron IPC bridge to register and start a malicious Model Context Protocol (MCP) server. With a CVSS score of 9.6 (CRITICAL), the vulnerability has a network attack vector, low attack complexity, and high impacts on confidentiality, integrity, and availability, requiring user interaction. Currently, there is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB, though it has garnered some community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 0.5.0CPE matchmatch criteria | cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.