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CVE-2026-25592 is an arbitrary file write vulnerability in Microsoft Semantic Kernel .NET SDK, specifically in the SessionsPythonPlugin component. The issue affects versions prior to the fixed release and stems from unsafe handling of attacker- or model-controlled local file path arguments in file transfer functions, particularly DownloadFileAsync; supporting content also references UploadFileAsync as affected by insufficient path validation. In the vulnerable implementation, DownloadFileAsync exposed a localFilePath parameter that ultimately controlled where File.WriteAllBytes() wrote data on the host, without adequate path validation, sanitization, or directory restriction. Additional reporting states DownloadFileAsync was inadvertently exposed to the model as a callable tool via the [KernelFunction] attribute, allowing prompt-influenced tool invocation to reach the vulnerable path. Researchers described an exploit chain in which code executed in the sandbox creates a malicious payload and then uses DownloadFileAsync to write that payload to an arbitrary host path such as the Windows Startup folder, enabling execution on next logon. The flaw demonstrates that model-controlled tool parameters must be treated as untrusted input and that localhost/sandbox assumptions do not provide a security boundary.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Microsoft Semantic Kernel where prompt injection could lead to remote code execution.
A Microsoft Semantic Kernel vulnerability referenced as evidence that LLMs are not security boundaries.
A vulnerability in Microsoft's Semantic Kernel referenced as demonstrating risks tied to locally trusted execution paths in AI agent ecosystems.
A Semantic Kernel remote code execution issue referenced as related prior research involving localhost trust assumptions.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.