Microsoft SharePoint hack: CERT-In flags ongoing threat, follow these steps to secure your systems
The Indian Computer Emergency Response Team (CERT-In) has raised a high-severity alert regarding a dangerous cyber vulnerability in Microsoft SharePoint Server. This warning highlights an actively exploited flaw that allows hackers to gain unauthorized control over servers. Consequently, organizations using SharePoint must act swiftly to secure their systems.
The critical issue, officially listed as CVE-2023-24955, affects specific versions of Microsoft SharePoint. Without the latest updates, systems remain vulnerable to attacks that could compromise sensitive data and paralyze operations.
What Is the Microsoft SharePoint Vulnerability?
To begin with, the flaw lies in how SharePoint processes specially crafted client requests. Unlike many other issues, this one permits remote code execution (RCE) without any user interaction. As a result, an attacker can execute commands on the system with elevated privileges—giving them the same power as an admin.
This type of vulnerability is particularly dangerous. Once exploited, it allows hackers to control the entire SharePoint server. Not only can they steal or delete data, but they can also install malware or create persistent backdoors to launch further attacks.
Why the Alert Matters Now
CERT-In’s warning comes at a time when cyberattacks on collaboration platforms have sharply increased. Since Microsoft SharePoint is widely used in businesses, government departments, and educational institutions, any compromise could have severe consequences.
In particular, hackers targeting SharePoint can:
- Steal confidential documents
- Encrypt data for ransom
- Alter or delete records
- Move laterally to compromise other parts of a network
Therefore, ignoring this vulnerability could expose organizations to data breaches, financial losses, and regulatory penalties.
Who Is at Risk?
The advisory specifically mentions two affected products:
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition
If your organization is using either of these versions without the latest security patches—especially those released in May 2023 or later—your systems are at high risk.
Many attackers are scanning the internet for unpatched SharePoint servers. Once they identify a vulnerable system, they can easily exploit it using automated tools and malicious scripts.
How Are Hackers Exploiting the Flaw?
Hackers often look for software vulnerabilities that can be remotely triggered. In this case, they are exploiting SharePoint servers by sending crafted requests that bypass input validation checks.
Once inside, cybercriminals deploy malicious PowerShell scripts, execute harmful code, or manipulate file structures. In several cases, they even create fake admin accounts to maintain long-term access.
Moreover, compromised systems are being offered for sale on the dark web. That indicates the exploit is not just theoretical—it’s part of real-world attacks happening right now.
Immediate Steps Recommended by CERT-In
To prevent compromise, CERT-In has outlined clear and actionable steps for all system administrators:
1. Install the Latest Security Updates
First and foremost, update your SharePoint servers with Microsoft’s security patches released in May 2023 or later. These patches fix the vulnerability and should be applied without delay.
👉 Microsoft Security Update Guide
2. Restrict Public Access
Next, avoid exposing SharePoint servers directly to the internet. Use firewalls, VPNs, and network segmentation to limit access to trusted users and IP addresses only.
3. Disable Unused Features
If your SharePoint environment includes unused modules or services, it’s best to turn them off. This reduces your attack surface and eliminates unnecessary risk.
4. Implement Multi-Factor Authentication (MFA)
Even if a hacker gains user credentials, MFA makes unauthorized access much more difficult. Enforcing MFA on all admin accounts adds a critical extra layer of security.
5. Monitor Logs and Network Behavior
Actively monitor system logs and network traffic. Look for signs of abnormal activity, such as unusual logins or unknown PowerShell executions.
6. Deploy Endpoint Protection Tools
Install and maintain Endpoint Detection and Response (EDR) tools. These systems help detect and stop threats before they spread across your network.
By following these steps, organizations can significantly reduce their risk and improve their overall cyber resilience.
Microsoft’s Official Response
Microsoft has addressed this issue in its May 2023 security update, confirming that timely patching will prevent exploitation. The company also recommends adopting a Zero Trust model, where no device or user is automatically trusted—even within the network.
Additionally, Microsoft urges organizations to make use of Microsoft Defender for Endpoint and advanced threat analytics for early detection of suspicious behavior.
A Wake-Up Call for Indian Businesses
This incident serves as a stark reminder of the rising cyber threat landscape in India. As digital adoption grows, so do the risks. Organizations must treat cybersecurity as a core business concern—not just an IT issue.
According to IBM’s latest report, the average cost of a data breach in India stands at ₹17.9 crore. That’s a significant hit, especially for businesses that may already be struggling with economic uncertainty.
Besides financial losses, data breaches also lead to loss of trust, customer churn, and damage to brand reputation. Therefore, proactive cybersecurity measures are essential—not optional.
Final Thoughts: Take Action Today
In conclusion, the Microsoft SharePoint vulnerability flagged by CERT-In is a serious and urgent issue. If your organization uses SharePoint, you cannot afford to wait. Review your systems, install the necessary updates, restrict access, and monitor for threats.
Cyberattacks are becoming more advanced and frequent. However, with timely action and strong security practices, you can protect your infrastructure from falling into the wrong hands.
Don’t wait for a breach to force your hand. Patch your SharePoint servers today.
