CVE-2026-20951 Microsoft SharePoint Server Remote Code Execution Vulnerability
An unauthorized attacker can execute code locally on Microsoft SharePoint Server due to improper input validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-20951?
CVE-2026-20951 is a high-severity code injection vulnerability in Microsoft Sharepoint Server, published on 13 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code locally.
Weakness: CWE-20
Which versions are affected by CVE-2026-20951?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2026-20951?
No fix has been published for CVE-2026-20951 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-20951 being exploited?
There is no known exploitation of CVE-2026-20951 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sharepoint Server
- CVE-2026-50522 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
- CVE-2026-58644 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2026-20963 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2025-53770 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2023-29357 Microsoft SharePoint Server Privilege Escalation
Sources
Also known as GHSA-gm7r-gh5f-5ghf.