CVE-2025-47166Sharepoint Server Insecure Deserialization
Microsoft SharePoint Server Remote Code Execution Vulnerability
Published Jun 9, 2025 · Updated Feb 26, 2026
Key Facts
Patch immediately- CVE-2025-47166 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Sharepoint Enterprise Server (Microsoft), Sharepoint Server (Microsoft), Microsoft SharePoint Enterprise Server 2016 and 2 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 22% probability of exploitation in the next 30 days.
- Fixed versions are available, including Microsoft SharePoint Enterprise Server 2016 16.0.5504.1001, Sharepoint Server 16.0.18526.20396, Microsoft SharePoint Server 2019 16.0.10417.20018.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
22%
Higher than 97.6% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
34/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Sharepoint Enterprise ServerMicrosoft | 2016 | n/a |
| Sharepoint ServerMicrosoft | 2019 | 16.0.18526.20396 |
| Microsoft SharePoint Enterprise Server 2016 | >= 16.0.0 | 16.0.5504.1001 |
| Microsoft SharePoint Server 2019 | >= 16.0.0 | 16.0.10417.20018 |
| Microsoft SharePoint Server Subscription Edition | >= 16.0.0 | 16.0.18526.20396 |
Patched Releases
Microsoft SharePoint Enterprise Server 2016
16.0.5504.1001
Sharepoint Server
16.0.18526.20396
Microsoft SharePoint Server 2019
16.0.10417.20018
Microsoft SharePoint Server Subscription Edition
16.0.18526.20396
Timeline
Publicly disclosed
Jun 9, 2025
Last updated
Feb 26, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
FAQ
Common Questions.
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Affected: Sharepoint Enterprise Server (Microsoft) versions 2016; Sharepoint Server (Microsoft) versions 2019; Microsoft SharePoint Enterprise Server 2016 versions >= 16.0.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Microsoft SharePoint Enterprise Server 2016 16.0.5504.1001, Sharepoint Server 16.0.18526.20396, Microsoft SharePoint Server 2019 16.0.10417.20018.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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