Cursor Agent is vulnerable to prompt injection via MCP Special Files_CVE-2025-54135

{
    "lastseen": "",
    "description": "Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9.",
    "published": "2025-08-05T00:11:07.363Z",
    "modified": "2025-08-05T13:58:39.517Z",
    "type": "cve",
    "title": "Cursor Agent is vulnerable to prompt injection via MCP Special Files",
    "source": "GitHub_M",
    "references": "https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm",
    "id": "CVE-2025-54135",
    "bulletinFamily": "",
    "cwe": [
        "CWE-78",
        "CWE-829"
    ],
    "cvelist": null,
    "sourceData": "cursor cursor < 1.3.9",
    "sourceHref": "",
    "cvss": {
        "score": 8.6,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/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": "cursor",
    "version": "< 1.3.9",
    "vendor": "cursor",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}