CVE-2025-29793Network attack vector

Authenticated code execution via untrusted deserialization

Published Apr 8, 2025 · Updated Aug 10, 2026

Deserialization of untrusted data in Microsoft SharePoint Server allows remote authenticated users to execute code over a network. Microsoft has not disclosed the affected component, serialized input format, or code path that accepts attacker-controlled data. Exploitation requires high-privilege SharePoint access and runs attacker-controlled code in the SharePoint server process context.

CVSS severity7.2
High
EPSS probability23.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Microsoft SharePoint Server allows remote authenticated users to execute code over a network. Microsoft has not disclosed the affected component, serialized input format, or code path that accepts attacker-controlled data. Exploitation requires high-privilege SharePoint access and runs attacker-controlled code in the SharePoint server process context.

The record

CVE
CVE-2025-29793
Published
Apr 8, 2025
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
Classifications
CWE-502, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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.

  1. Affected versionversion=16.0.0 <16.0.5495.1002

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Microsoft · Microsoft SharePoint Enterprise Server 2016version=16.0.0 <16.0.5495.1002
Microsoft · Microsoft SharePoint Server 2019version=16.0.0 <16.0.10417.20003
Microsoft · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.18526.20172

Published CVSS scores

7.2Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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