If you’ve been following cybersecurity news this week, you’ll have heard about several new vulnerabilities affecting Windows systems and Microsoft 365. The good news? Patches are already available. The important part? You need to apply them soon.

This isn’t the usual “software update” conversation. These particular issues are serious enough that they’re being actively exploited in the wild—meaning hackers are already using them to break into businesses. We’re writing this because it affects you directly, and delays can leave your company exposed.

Why This Matters for Your Business

When vulnerabilities go public, the clock starts ticking. Within days of a patch release, cybercriminals adapt their tools to exploit the gap between announcement and installation. The longer you wait, the higher your risk.

For Irish businesses subject to GDPR (enforced by the Data Protection Commission), there’s also a compliance angle. If you suffer a breach that exploits a known, unpatched vulnerability, the DPC can question whether you took reasonable steps to protect personal data. That’s not a conversation you want to have.

Which Systems Are Affected?

The most urgent patches involve:

• Windows 10 and Windows 11 — all currently supported versions
• Windows Server — 2019, 2022, and 2025
• Microsoft 365 — including Outlook, Teams, and Exchange

If your business runs any of these (and most Dublin-based SMEs do), this applies to you.

What Should You Do?

First, check your current patch status. If you’re using a managed IT provider, they should already be coordinating this. If you’re managing updates yourself, log into your systems and verify you’re up to date. Microsoft’s patch Tuesday was earlier this month—check that your devices installed those updates.

Second, prioritize your critical systems. Not everything can be patched simultaneously without disruption. Your email servers, file servers, and client devices should go first. Less critical systems can follow.

Third, test before rolling out to everyone. If you have a small test environment, patch a few machines first to spot any compatibility issues. This is especially important if you run older software or custom applications that might interact badly with patches.

If you don’t have the capacity to manage this internally, this is exactly what managed IT support exists for. A provider can handle staged rollouts, minimizing downtime while keeping you protected.

The Real Cost of Waiting

Patching takes a few hours of IT time and might mean a restart or two. A breach costs thousands in incident response, potential fines, customer notification, and reputational damage. The math is straightforward.

Next Steps

Check with whoever manages your IT—whether that’s an internal team member or an external provider—and ask specifically about the June 2026 patches. Ask when they’ll be deployed and whether any systems need testing first.

If you’re unsure who to ask or don’t have anyone on your team handling this, reach out to your existing IT support. If you don’t have IT support at all, this is a good time to talk to someone about covering at least your security patching going forward.

Your systems are valuable. Keeping them patched is how you keep them secure.