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CVE-2025-66481

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Date: December 8, 2025

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.

Severity Score

Related Resources (3)

https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4
https://nvd.nist.gov/vuln/detail/CVE-2025-66481
https://www.mend.io/vulnerability-database/CVE-2025-66481

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Improper Control of Generation of Code ('Code Injection')

CWE-94

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

CWE-80

Top Fix

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Upgrade Version

Upgrade to version https://github.com/ThinkInAIXYZ/deepchat.git - v0.5.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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