The Microsoft SharePoint cyberattack is serious; a zero-day vulnerability is under active exploitation, with hackers targeting on-prem servers worldwide. They’re stealing cryptographic keys, forging trusted tokens, and slipping back in even after systems are patched. It’s the kind of nightmare that makes IT teams lose sleep — because once these attackers get the keys, they can bypass protections like they own the network
Hundreds of Servers at Risk
According to Yahoo Finance and The Washington Post, the breach isn’t minor. At least 75 servers have already been compromised, and security researchers believe that number could be in the hundreds. Federal agencies, universities, energy companies — even global telecom carriers — are in the line of fire. Some IT teams are going as far as pulling the plug on their servers entirely to stop the bleeding.
Emergency Patches & Why It’s Worse Than It Looks
Microsoft has released emergency patches for SharePoint 2019 and Subscription Edition, but SharePoint 2016? Still exposed. The Cybersecurity and Infrastructure Security Agency (CISA) warns: assume you’re already compromised, rotate your keys now, and scan your systems for suspicious activity.
What makes this zero-day so dangerous? It’s not just about breaking into SharePoint. With the stolen cryptographic keys, hackers can forge tokens that give them access to connected apps like Teams, Outlook, or OneDrive — a full ecosystem compromise. This isn’t your everyday bug fix. It’s a “patch now, or regret it later” situation.
Microsoft’s Security Problem
Cybersecurity firm Eye Security, which first detected the attacks, says they’ve already intercepted dozens of intrusion attempts. But their warning is crystal clear: hundreds of organizations may already be compromised and don’t even know it yet.
This isn’t the first major Microsoft security scare this year. From Exchange vulnerabilities to issues with legacy Windows platforms, it’s becoming obvious that older systems are soft targets. Businesses still running Windows 10 are already in a tricky spot — with Windows 11 adoption stats showing that many haven’t made the jump, they’re left patching old holes while hackers find new ones.
And if you’ve been burned by weird Windows 11 restore point issues, you know how messy recovering from these attacks can get. Now imagine dealing with a compromised SharePoint server on top of that.
Update your on-prem SharePoint immediately, rotate your keys, and secure every system as if it’s already compromised. This attack isn’t slowing down — and waiting for an official fix or statement from Microsoft could cost you everything.
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