Authenticated content spoofing via DownloadFile path control
Published May 13, 2025 · Updated Feb 26, 2026
Path-control spoofing in Microsoft .NET SDK and Visual Studio MSBuild allows remote authenticated users to present untrusted build content. The DownloadFile build task accepts externally controlled file names or paths, but Microsoft has not disclosed the specific unsafe file operation. Exploitation requires a project that invokes DownloadFile and user interaction, with resulting confidentiality, integrity, and availability effects.
Summary
What happened
Path-control spoofing in Microsoft .NET SDK and Visual Studio MSBuild allows remote authenticated users to present untrusted build content. The DownloadFile build task accepts externally controlled file names or paths, but Microsoft has not disclosed the specific unsafe file operation. Exploitation requires a project that invokes DownloadFile and user interaction, with resulting confidentiality, integrity, and availability effects.
The record
- CVE
- CVE-2025-26646
- Published
- May 13, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Microsoft Visual Studio 2022 version 17.13
- Classifications
- CWE-73, T1204.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 13, 2025CVE publishedPublication date reported by the CVE source.
- Feb 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=17.13.0 <17.13.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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