DeepChat’s Incomplete XSS Fix Allows RCE through Mermaid Content_CVE-2025-66481

{
    "lastseen": "",
    "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.",
    "published": "2025-12-09T00:25:08.301Z",
    "modified": "2025-12-09T00:25:08.301Z",
    "type": "cve",
    "title": "DeepChat's Incomplete XSS Fix Allows RCE through Mermaid Content",
    "source": "GitHub_M",
    "references": "https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4",
    "id": "CVE-2025-66481",
    "bulletinFamily": "",
    "cwe": [
        "CWE-80",
        "CWE-79",
        "CWE-94"
    ],
    "cvelist": null,
    "sourceData": "ThinkInAIXYZ deepchat <= 0.5.1",
    "sourceHref": "",
    "cvss": {
        "score": 9.7,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "deepchat",
    "version": "<= 0.5.1",
    "vendor": "ThinkInAIXYZ",
    "ai_description": "XSS vulnerability in DeepChat through improperly sanitized Mermaid content, allowing Remote Code Execution via electron.ipcRenderer interface",
    "ai_severity": "Critical",
    "ai_vendor": "ThinkInAIXYZ",
    "ai_product": "DeepChat",
    "ai_version": "0.5.1 and below",
    "ai_score": 9.7
}