Semantic Kernel has an Arbitrary File Write via AI Agent Function Calling in .NET SDK_CVE-2026-25592

{
    "lastseen": "",
    "description": "Semantic Kernel is an SDK used to build, orchestrate, and deploy AI agents and multi-agent systems. Prior to 1.70.0, an Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel\u202f.NET SDK, specifically within the\u202fSessionsPythonPlugin. The problem has been fixed in Microsoft.SemanticKernel.Core version 1.70.0. As a mitigation, users can create a Function Invocation Filter which checks the arguments being passed to any calls to DownloadFileAsync\u202f or UploadFileAsync and ensures the provided localFilePath is allow listed.",
    "published": "2026-02-06T20:38:28.770Z",
    "modified": "2026-02-06T20:38:28.770Z",
    "type": "cve",
    "title": "Semantic Kernel has an Arbitrary File Write via AI Agent Function Calling in .NET SDK",
    "source": "GitHub_M",
    "references": "https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-2ww3-72rp-wpp4\nhttps://github.com/microsoft/semantic-kernel/pull/13478/changes#diff-88d3cacba2bfa84eef8f2aa171b34f9940338cbb784a3ffc49f5fe3af1b8943d\nhttps://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs#L61-L64",
    "id": "CVE-2026-25592",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "microsoft semantic-kernel < 1.70.0",
    "sourceHref": "",
    "cvss": {
        "score": 10,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/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": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "semantic-kernel",
    "version": "< 1.70.0",
    "vendor": "microsoft",
    "ai_description": "Arbitrary File Write vulnerability in Microsoft's Semantic Kernel .NET SDK",
    "ai_severity": "Critical",
    "ai_vendor": "Microsoft",
    "ai_product": "Semantic Kernel",
    "ai_version": "< 1.70.0",
    "ai_score": 10
}