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Cyber Security Agency of Singapore
Alerts

High-Severity Vulnerability in Microsoft Sharepoint

29 May 2026

Microsoft has released security updates addressing a remote code execution vulnerability in SharePoint. Users and administrators of affected products are advised to update to the latest versions immediately.

Background

Microsoft has released security updates addressing a remote code execution vulnerability (CVE-2026-45659) in SharePoint. This vulnerability has a Common Vulnerability Scoring System (CVSS v3.1) score of 8.8 out of 10.

Impact

Successful exploitation of this vulnerability may allow a remote authenticated attacker with low privileges to send crafted serialised payloads to a vulnerable SharePoint server, resulting in remote code execution over the network. This may lead to unauthorised access to sensitive information, execution of arbitrary commands, privilege escalation and system compromise.

Affected Products

This vulnerability affects the following Microsoft SharePoint products:

  • SharePoint Server Subscription Edition, build number earlier than 16.0.19725.20280

  • SharePoint Server 2019, build number earlier than 16.0.10417.20128

  • SharePoint Server 2016, build number earlier than 16.0.5552.1002

Recommendations

Users and administrators of affected products are advised to update to the latest versions immediately. 

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659

https://nvd.nist.gov/vuln/detail/CVE-2026-45659

https://thehackernews.com/2026/05/microsoft-patches-sharepoint-rce-flaw.html

https://www.helpnetsecurity.com/2026/05/26/sharepoint-vulnerability-cve-2026-45659

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