Arbitrary File Write Vulnerability in Microsoft Semantic Kernel .NET SDK
CVE-2026-25592

10CRITICAL

Key Information:

Vendor

Microsoft
Status
Semantic-kernel
Vendor
CVE Published:
6 February 2026

What is CVE-2026-25592?

An Arbitrary File Write vulnerability exists in Microsoft’s Semantic Kernel .NET SDK, specifically within the SessionsPythonPlugin, prior to version 1.70.0. This flaw allows possible unauthorized file writes which can lead to potential exploitation by malicious users. Users are advised to upgrade their SDK to version 1.70.0 or implement a Function Invocation Filter that checks the arguments for the DownloadFileAsync and UploadFileAsync methods, thereby ensuring that any localFilePath is on an allowlist to mitigate this risk.

Affected Version(s)

semantic-kernel < 1.71.0

References

https://github.com/microsoft/semantic-kernel/security/adv...
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https://github.com/microsoft/semantic-kernel/pull/13478/c...
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https://github.com/microsoft/semantic-kernel/blob/main/do...
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CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.