30/09/2026
🚨 Vulnerability Update: SharePoint servers under active attack
If your business runs SharePoint on its own servers, this one needs your attention today.
Attackers are now exploiting CVE-2026-65660, a remote code ex*****on flaw in Microsoft SharePoint Server 2016, 2019 and Subscription Edition. Microsoft fixed it back in August. The attacks only started after researchers published the technical details last week. For anyone who skipped the August updates, the clock is now running.
Here's what makes it serious:
🔹 An attacker needs only a basic user account, not admin rights
🔹 Attackers have been spotted trying to plant hidden backdoors (webshells)
🔹 Microsoft first labelled it a medium-risk issue, so plenty of teams may have pushed it down the list
What to do now:
✅ Apply Microsoft's August 2026 SharePoint security updates
✅ Make sure SharePoint isn't directly exposed to the internet
✅ Check your servers for unfamiliar files or unusual activity
✅ Review who has site member access, and remove old or unused accounts
This is a good reminder that "patched months ago" and "patched on our servers" aren't the same thing.
Not sure if your SharePoint environment is up to date? The Jypra Group team can check it for you. Get in touch.