CVE-2025-59228: CWE-20: Improper Input Validation in Microsoft Microsoft SharePoint Enterprise Server 2016
Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AI Analysis
Technical Summary
CVE-2025-59228 is a vulnerability identified in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) stemming from improper input validation (CWE-20). This flaw allows an attacker with authorized access to the SharePoint server to execute arbitrary code remotely over the network. The vulnerability does not require user interaction, increasing its risk profile. The CVSS 3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The attack vector is network-based (AV:N), with low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N). The vulnerability scope is unchanged (S:U), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the vulnerability's characteristics suggest it could be leveraged for remote code execution, potentially allowing attackers to take full control of affected SharePoint servers. SharePoint Enterprise Server 2016 is widely used in enterprise environments for collaboration and document management, making this vulnerability significant. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies to reduce exposure.
Potential Impact
For European organizations, this vulnerability poses a significant risk due to the widespread use of Microsoft SharePoint Enterprise Server 2016 in government, financial, healthcare, and critical infrastructure sectors. Successful exploitation could lead to unauthorized access, data breaches, disruption of services, and potential lateral movement within networks. Confidential information stored or processed via SharePoint could be exposed or altered, undermining data integrity and compliance with regulations such as GDPR. The ability to execute code remotely without user interaction increases the likelihood of automated or targeted attacks. Disruption of SharePoint services could impact business continuity and collaboration workflows. Organizations relying heavily on SharePoint for document management and internal communications are particularly vulnerable to operational and reputational damage.
Mitigation Recommendations
Until official patches are released, organizations should implement strict access controls limiting SharePoint administrative and user privileges to the minimum necessary. Network segmentation should isolate SharePoint servers from untrusted networks and restrict access to trusted IPs only. Employ monitoring and logging to detect unusual activities or attempts to exploit the vulnerability, including anomalous input patterns or unexpected code execution attempts. Use Web Application Firewalls (WAFs) with custom rules to filter potentially malicious input targeting SharePoint endpoints. Regularly review and update SharePoint configurations to disable unnecessary features or services that could be exploited. Prepare for rapid deployment of patches once available by maintaining an up-to-date asset inventory and patch management process. Conduct security awareness training for administrators to recognize exploitation indicators. Consider deploying endpoint detection and response (EDR) solutions to identify and contain potential intrusions early.
Affected Countries
Germany, United Kingdom, France, Netherlands, Italy, Spain, Poland, Sweden
CVE-2025-59228: CWE-20: Improper Input Validation in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AI-Powered Analysis
Technical Analysis
CVE-2025-59228 is a vulnerability identified in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) stemming from improper input validation (CWE-20). This flaw allows an attacker with authorized access to the SharePoint server to execute arbitrary code remotely over the network. The vulnerability does not require user interaction, increasing its risk profile. The CVSS 3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The attack vector is network-based (AV:N), with low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N). The vulnerability scope is unchanged (S:U), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the vulnerability's characteristics suggest it could be leveraged for remote code execution, potentially allowing attackers to take full control of affected SharePoint servers. SharePoint Enterprise Server 2016 is widely used in enterprise environments for collaboration and document management, making this vulnerability significant. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies to reduce exposure.
Potential Impact
For European organizations, this vulnerability poses a significant risk due to the widespread use of Microsoft SharePoint Enterprise Server 2016 in government, financial, healthcare, and critical infrastructure sectors. Successful exploitation could lead to unauthorized access, data breaches, disruption of services, and potential lateral movement within networks. Confidential information stored or processed via SharePoint could be exposed or altered, undermining data integrity and compliance with regulations such as GDPR. The ability to execute code remotely without user interaction increases the likelihood of automated or targeted attacks. Disruption of SharePoint services could impact business continuity and collaboration workflows. Organizations relying heavily on SharePoint for document management and internal communications are particularly vulnerable to operational and reputational damage.
Mitigation Recommendations
Until official patches are released, organizations should implement strict access controls limiting SharePoint administrative and user privileges to the minimum necessary. Network segmentation should isolate SharePoint servers from untrusted networks and restrict access to trusted IPs only. Employ monitoring and logging to detect unusual activities or attempts to exploit the vulnerability, including anomalous input patterns or unexpected code execution attempts. Use Web Application Firewalls (WAFs) with custom rules to filter potentially malicious input targeting SharePoint endpoints. Regularly review and update SharePoint configurations to disable unnecessary features or services that could be exploited. Prepare for rapid deployment of patches once available by maintaining an up-to-date asset inventory and patch management process. Conduct security awareness training for administrators to recognize exploitation indicators. Consider deploying endpoint detection and response (EDR) solutions to identify and contain potential intrusions early.
Affected Countries
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-09-11T00:32:30.951Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 68ee858d3dd1bfb0b7e40cf7
Added to database: 10/14/2025, 5:17:01 PM
Last enriched: 10/14/2025, 5:53:12 PM
Last updated: 10/16/2025, 2:27:26 PM
Views: 18
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