Authenticated code execution via undisclosed authorization flaw
Published Feb 11, 2025 · Updated Feb 13, 2026
Improper authorization in Microsoft SharePoint Server 16.0 allows remote authenticated users to execute code after user interaction. Microsoft has not published the affected request path or the authorization check that accepts an unauthorized operation. Exploitation requires low-privilege access and user interaction and grants code execution in the SharePoint server context.
Summary
What happened
Improper authorization in Microsoft SharePoint Server 16.0 allows remote authenticated users to execute code after user interaction. Microsoft has not published the affected request path or the authorization check that accepts an unauthorized operation. Exploitation requires low-privilege access and user interaction and grants code execution in the SharePoint server context.
The record
- CVE
- CVE-2025-21400
- Published
- Feb 11, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-285, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 11, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 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=16.0.0 <16.0.5487.1000
What conditions does exploitation require?
What is affected?
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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