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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-66222
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-03 19:15:58 UTC
Updated2026-10-18 17:10:00 UTC
DescriptionDeepChat 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

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

EPSS: 0.006070000 probability, percentile 0.479850000 (date 2026-10-18)

Problem Types: CWE-94 | CWE-79 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED9.7CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Thinkinai Deepchat All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ThinkInAIXYZ Deepchat affected < 0.5.0 Not specified

References

ReferenceSourceLinkTags
github.com/ThinkInAIXYZ/deepchat/commit/371ca7b42e3685aee6e3f0c61e85277e... [email protected] github.com Patch
github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-v8v5-c872-mf8r [email protected] github.com Exploit, Vendor Advisory
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