Microsoft SharePoint Zero-Day Exploited in Active RCE Attacks — With No Patch in Sight
In a stark reminder of the growing sophistication and urgency of cyber threats, BleepingComputer reports that a zero-day vulnerability in Microsoft SharePoint is being actively exploited in remote code execution (RCE) attacks. Most concerning? There is no patch currently available.
This vulnerability, tracked as CVE-2023-29357, affects Microsoft SharePoint Server 2019 and earlier versions and allows attackers to bypass authentication and gain elevated privileges—effectively giving them the keys to your corporate kingdom. Security researchers revealed that attackers are chaining this flaw with another bug (CVE-2023-24955) to execute arbitrary code on target systems.
Even though a patch for CVE-2023-24955 was released in June 2023, CVE-2023-29357 remains unpatched. And the exploit is already being used in the wild. If your organization relies on SharePoint, your infrastructure could already be at risk—even if you've applied all available updates.
What This Means for Your Business
Zero-days like this are the nightmare scenario for any IT or cybersecurity team. They leave no time to prepare, and in cases like this, no vendor patch to apply. Attackers love targeting platforms like SharePoint, widely used for collaboration and document management across industries. Once inside, they can move laterally, escalate privileges, and exfiltrate sensitive data without detection.
If your security strategy is built around "detect and respond", you're playing a dangerous game of catch-up—especially when adversaries are already inside your network before alerts can even be triggered.
“Detect and Respond” Is Failing. It's Time for “Isolation and Containment.”
The SharePoint zero-day scenario underscores the urgent need for a paradigm shift in cybersecurity defense strategies. We can no longer rely solely on detection tools like EDRs and SIEMs. While valuable, they react after a compromise has begun—often too late to prevent damage.
Instead, businesses must adopt prevention-first strategies through isolation and containment. This is exactly what AppGuard delivers.
How AppGuard Protects Against Zero-Day Exploits
AppGuard is a field-proven endpoint protection solution with a 10-year track record of stopping advanced attacks—including zero-days, fileless malware, and remote code execution—before they cause harm.
Unlike traditional antivirus or EDR tools, AppGuard doesn’t need to detect malware to stop it. It proactively blocks malicious behaviors by:
-
Preventing unauthorized code execution—even when it's never been seen before
-
Containing processes so they can’t exploit legitimate applications like SharePoint
-
Stopping lateral movement and privilege escalation before they begin
With AppGuard, attacks that rely on exploiting unpatched vulnerabilities like CVE-2023-29357 simply cannot execute. There’s no need to wait for a patch. AppGuard ensures the threat is neutralized before it can do harm.
The Bottom Line: Prevention Must Replace Reaction
Cyber threats are evolving too fast for legacy tools and reactive strategies to keep up. The SharePoint zero-day exploit highlights a harsh truth: you won’t always have time to patch, and detection tools won’t always catch it in time.
Businesses need solutions that assume the worst—and are built to contain and neutralize threats before they can execute.
At CHIPS, we help organizations protect their operations with AppGuard, an enterprise-grade solution now available for commercial use. It’s time to move beyond “detect and respond” and embrace the security of “isolation and containment.”
If your organization uses Microsoft SharePoint—or any critical enterprise application—you can’t afford to wait for the next patch or next breach. Contact us at CHIPS to learn how AppGuard can protect your business against the unknown and the unpatched.
Like this article? Please share it with others!
Comments