VULNERABILITY INTELLIGENCE

CVE-2025-66481

CVSS score9.6 CRITICAL
EPSS probability0.58%
CISA KEVNot currently listed
Published2025-12-09
Last modified2026-10-07
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Description

DeepChat is an open-source AI chat platform that supports cloud models and LLMs. Versions 0.5.1 and below are vulnerable to XSS attacks through improperly sanitized Mermaid content. The recent security patch for MermaidArtifact.vue is insufficient and can be bypassed using unquoted HTML attributes combined with HTML entity encoding. Remote Code Execution is possible on the victim's machine via the electron.ipcRenderer interface, bypassing the regex filter intended to strip dangerous attributes. There is no fix at time of publication.

Weakness classification

  • security-advisories@github.com: CWE-79
  • nvd@nist.gov: CWE-79

Primary references