by Kastro
Paper/Archive/CVE-2026-25592

CVE-2026-25592

microsoft semantic-kernel — Semantic Kernel has an Arbitrary File Write via AI Agent Function Calling in .NET SDK

EPSS 3%CVSS 10.0
critical.is priorityof 100
47
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 85.1.851 × 2017.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Semantic Kernel is an SDK used to build, orchestrate, and deploy AI agents and multi-agent systems. Prior to 1.71.0, an Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel .NET SDK, specifically within the SessionsPythonPlugin. The problem has been fixed in Microsoft.SemanticKernel.Core version 1.71.0. As a mitigation, users can create a Function Invocation Filter which checks the arguments being passed to any calls to DownloadFileAsync  or UploadFileAsync and ensures the provided localFilePath is allow listed.

Affected

ProductAffectedFixed inSource
semantic-kernel< 1.71.0–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/microsoft/semantic-kernel/security/advisories/GHSA-2ww3-72rp-wpp4refgithub.com/microsoft/semantic-kernel/pull/13478/changes#diff-88d3cacba2bfa84eef8f2aa171b34f9940338cbb784a3ffc49f5fe3af1b8943drefgithub.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs#L61-L64