Highlights
- A dangerous flaw in on-premises Microsoft SharePoint Server is being actively exploited worldwide
- Over 50 organizations have already been affected by this specific vulnerability
- Australia’s top cyber agency urges immediate patching and system hardening
If your company is using Microsoft SharePoint Server on its own servers, and not the cloud version, you probably need to look into this.
There’s a new vulnerability , it’s being tracked as CVE-2025-53770 , and honestly, it’s not something to take lightly.
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I know not everyone checks Microsoft blogs or tech tutorials every day. But this one’s serious because it’s being actively used by attackers right now. So I figured it’s better I explain it in plain English.
There’s a Big Microsoft SharePoint Vulnerability You Shouldn’t Ignore
What’s Going On
Basically, this flaw lets someone run harmful code on your SharePoint Server. And they don’t even need to log in or have access. It works remotely, over the network. Which is pretty dangerous if you think about it.
According to reports, more than 50 organizations have already been affected. That’s not small. And the Australian Cyber Security Centre (ACSC) even called it critical , which they don’t do unless it’s something real bad.
Image Credits: Microsoft
Again, this doesn’t affect SharePoint Online . That’s the version you use on Microsoft’s cloud. So if you’re using that, you’re good. But if you’ve got SharePoint running on your company’s own physical server, then yeah, you’re in the danger zone.
What You Should Do
Microsoft gave a few steps, and honestly, it’s best to just follow them:
- Make sure you’re using a supported version of SharePoint Server. If not, update it.
- When the July 2025 Security Update drops, install it right away .
- Enable AMSI (that’s Antimalware Scan Interface). Check if it’s on and working with your antivirus, like Microsoft Defender .
- Add a solid endpoint protection tool , something like Defender for Endpoint, or whatever you trust.
- Also, don’t forget to rotate your ASP.NET machine keys once in a while. It’s just a good practice.
It might seem like a lot, but most of this stuff is regular security hygiene. The difference now is, with this vulnerability being live and exploited, delays can cost you.
Look, if you’re running on-premises SharePoint , you can’t ignore this. It’s not some theoretical bug. It’s real, it’s active, and attackers are out there looking for outdated servers.
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