CVE-2026-63520 Microsoft SharePoint Server Remote Code Execution Vulnerability
An unauthorized attacker can execute arbitrary code remotely on Microsoft SharePoint Server due to improper input validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63520?
CVE-2026-63520 is a high-severity code injection vulnerability in Microsoft Sharepoint Server, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Weakness: CWE-20
Which versions are affected by CVE-2026-63520?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2026-63520?
No fix has been published for CVE-2026-63520 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-2026-63520 being exploited?
There is no known exploitation of CVE-2026-63520 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
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-cj4w-v2c3-7qjr.