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Vulnerability details

CVE-2026-25592

Microsoft semantic-kernel

Semantic Kernel has an Arbitrary File Write via AI Agent Function Calling in .NET SDK

CVSS 3.1
10.0Critical

Official description

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.

CVSS scores

ScoreVersionSourceVector
10.0Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
Microsoft semantic-kernel < 1.71.0 CVEProject cvelistV5 (CNA)

References and advisories

3
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Details

Published
2026-02-07
Last updated
2026-02-19
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

2.52%
Probability of exploitation in 30 days
84.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-22
    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')