CVE-2025-66562CWE-79CWE-94cross-site-scriptingcode-injection

CVE-2025-66562

Critical · published December 5, 2025

CVSS v3.1
9.6
EPSS
1%
Percentile
43.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00523 · 43.5th percentile
Weaknesses
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'); CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2025-12-05T23:15Z
Affected products (1)
ProductVersionsFixed in
aiql/tuui< 1.3.41.3.4
References (3)
https://github.com/AI-QL/tuui/commit/f673fa5b4d76e8236c7d9506d0727875cfa79cc1 · [email protected]https://github.com/AI-QL/tuui/releases/tag/v1.3.4 · [email protected]https://github.com/AI-QL/tuui/security/advisories/GHSA-qjhq-rgmr-6c3g · [email protected]
EPSS history
Timeline
  • 05 DEC 18:03Z
    TUUI vulnerable to Remote Code Execution (RCE) via XSS in Markdown ECharts Rendering
    cvelistv5