8.8High
Microsoft Sharepoint Server
CVE-2026-65660
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
What this means for your business
- It affects Microsoft Sharepoint Server. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, with an ordinary user login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.8% chance of attack attempts being seen in the next 30 days, ranking above 54% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Microsoft Sharepoint Server, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 8.8 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness
- CWE-94
- Assigned by
- secure@microsoft.com
Dates
- Published
- 2026-08-11
- Last modified
- 2026-08-27
- Sources
- NVD
Affected products
- Microsoft Sharepoint Server- 16.0.19725.20522, 2016, 2019
As listed in the NVD configuration data. Not a statement about your estate.
Coverage
- SharePoint Flaw Initially Listed as Spoofing by Microsoft Enables Authenticated RCEThe Hacker News · 2026-09-22