---
id: CVE-2025-66562
title: TUUI is a desktop MCP client designed as a tool unitary utility integration
summary: >-
  TUUI is a desktop MCP client designed as a tool unitary utility integration.
  Prior to 1.3.4, a critical Remote Code Execution (RCE) vulnerability exists in
  Tuui due to an unsafe Cross-Site Scripting (XSS) flaw in the Markdown
  rendering c…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-79
  - CWE-94
vendor: aiql
product: tuui
affected:
  - tuui < 1.3.4
patched:
  - tuui 1.3.4
published: '2025-12-05'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66562'
references:
  - url: >-
      https://github.com/AI-QL/tuui/commit/f673fa5b4d76e8236c7d9506d0727875cfa79cc1
    label: security-advisories@github.com
  - url: 'https://github.com/AI-QL/tuui/releases/tag/v1.3.4'
    label: security-advisories@github.com
  - url: 'https://github.com/AI-QL/tuui/security/advisories/GHSA-qjhq-rgmr-6c3g'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00523
epssPercentile: 0.41905
ingestedAt: '2026-09-25T23:21:16.898Z'
---

## Overview

TUUI is a desktop MCP client designed as a tool unitary utility integration. Prior to 1.3.4, a critical Remote Code Execution (RCE) vulnerability exists in Tuui due to an unsafe Cross-Site Scripting (XSS) flaw in the Markdown rendering component. Tuui allows the execution of arbitrary JavaScript within ECharts code blocks. Combined with an exposed IPC interface that allows spawning processes, an attacker can execute arbitrary system commands on the victim's machine simply by having them view a malicious Markdown message. This vulnerability is fixed in 1.3.4.

## Affected

- `tuui < 1.3.4`

## Remediation

Upgrade past the affected range:

- `tuui 1.3.4`