Microsoft SharePoint Server Remote Code Execution Vulnerability
Published August 11, 2026Updated September 25, 2026
Source data
Overview
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Impact & technical details
Remote Code Execution
There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software? Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.
I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running? Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.
How could an attacker exploit this vulnerability? An authenticated attacker with low-level access to an affected server could send a specially crafted request to execute code on the server. User interaction is not required.
- CVSS base score
- 8.8 / 10
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.
Affected products
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition
Source guidance
Remediation
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.
GTP recommendation · Rule-based guidance
Recommended next step
Prioritize deployment of the available security update after appropriate compatibility validation.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
- Microsoft Security Response Center (opens in a new tab)
- Microsoft security update · 5002905 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5002906 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5002894 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5002896 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5002893 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- CISA Known Exploited Vulnerabilities (opens in a new tab)
- Authoritative advisory (opens in a new tab)
- Authoritative advisory (opens in a new tab)
- NIST National Vulnerability Database (opens in a new tab)
Managed by GTP?
Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.