Code execution via untrusted-data deserialization
Published May 13, 2025 · Updated Feb 13, 2026
Deserialization of untrusted data in affected Microsoft SharePoint Server releases allows attackers to execute code locally. Microsoft has not disclosed the affected component, deserialization API, or path by which attacker-controlled data reaches it. Exploitation requires local access, high-complexity conditions, and user interaction; successful exploitation runs attacker-chosen code on the server.
Summary
What happened
Deserialization of untrusted data in affected Microsoft SharePoint Server releases allows attackers to execute code locally. Microsoft has not disclosed the affected component, deserialization API, or path by which attacker-controlled data reaches it. Exploitation requires local access, high-complexity conditions, and user interaction; successful exploitation runs attacker-chosen code on the server.
The record
- CVE
- CVE-2025-30378
- Published
- May 13, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-502, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 13, 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 <16.0.5500.1001
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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