CVE-2026-65660 Microsoft SharePoint Code Injection
An authorized attacker can execute arbitrary code remotely on Microsoft SharePoint Server via improper code generation control.
- Exploited in the wild
- Since 25 Sep 2026
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65660?
CVE-2026-65660 is a high-severity code injection vulnerability in Microsoft Sharepoint Server, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Weakness: CWE-94
Which versions are affected by CVE-2026-65660?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2026-65660?
No fix has been published for CVE-2026-65660 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 28 Sep 2026.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-65660 being exploited?
Yes. Attackers have exploited CVE-2026-65660 in the wild since at least 25 Sep 2026.
Public exploit code: 2 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-r94x-x846-rxqx.