Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?
The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. This means an attacker or victim needs to execute code from the local machine to exploit the vulnerability.
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
The user must open or load attacker‑controlled content—such as importing a malicious WSDL or opening a file—so the application processes it and triggers the vulnerability.
Security updates
16.0.5535.1001 — https://support.microsoft.com/help/5002828
16.0.10417.20083 — https://support.microsoft.com/help/5002825
16.0.19127.20442 — https://support.microsoft.com/help/5002822
Vulnerabilities 1
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High 7.8
Microsoft SharePoint Server Remote Code Execution Vulnerability
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code locally.
Revision history
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#1
Information published.
References
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CVE-2026-20951 Microsoft SharePoint Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20951
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss