CVE-2025-66481

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.

CVSS v3 9.6 CRITICAL

9.6^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4	Exploit Vendor Advisory
https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:*

History

07 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) DeepChat es una plataforma de chat de IA de código abierto que soporta modelos en la nube y LLMs. Las versiones 0.5.1 e inferiores son vulnerables a ataques de XSS a través de contenido Mermaid incorrectamente saneado. El reciente parche de seguridad para MermaidArtifact.vue es insuficiente y puede ser eludido usando atributos HTML sin comillas combinados con codificación de entidades HTML. La ejecución remota de código es posible en la máquina de la víctima a través de la interfaz electron.ipcRenderer, eludiendo el filtro de expresiones regulares destinado a eliminar atributos peligrosos. No hay solución en el momento de la publicación.

Information

Published : 2025-12-09 01:16

Updated : 2026-10-07 20:10

NVD link : CVE-2025-66481

Mitre link : CVE-2025-66481

CVE.ORG link : CVE-2025-66481

JSON object : View

Products Affected

thinkinai

deepchat

CWE

CWE-79

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

CWE-80

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

CWE-94

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

{"id": "CVE-2025-66481", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66481", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2025-12-09T14:17:46.241244Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.6, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "ThinkInAIXYZ", "product": "deepchat", "versions": [{"status": "affected", "version": "<= 0.5.1"}]}]}], "published": "2025-12-09T01:16:55.140", "references": [{"url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-80"}, {"lang": "en", "value": "CWE-94"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "DeepChat es una plataforma de chat de IA de c\u00f3digo abierto que soporta modelos en la nube y LLMs. Las versiones 0.5.1 e inferiores son vulnerables a ataques de XSS a trav\u00e9s de contenido Mermaid incorrectamente saneado. El reciente parche de seguridad para MermaidArtifact.vue es insuficiente y puede ser eludido usando atributos HTML sin comillas combinados con codificaci\u00f3n de entidades HTML. La ejecuci\u00f3n remota de c\u00f3digo es posible en la m\u00e1quina de la v\u00edctima a trav\u00e9s de la interfaz electron.ipcRenderer, eludiendo el filtro de expresiones regulares destinado a eliminar atributos peligrosos. No hay soluci\u00f3n en el momento de la publicaci\u00f3n."}], "lastModified": "2026-10-07T20:10:01.970", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D827ED0C-D2C6-4D0A-B8F4-B448115E4F56", "versionEndIncluding": "0.5.1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}