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Critical Vulnerabilities in Microsoft SharePoint: CVE-2025-53770 and CVE-2025-53771

  • Writer: Nik Lipor
    Nik Lipor
  • Jul 21
  • 2 min read

Updated: 1 day ago

Understanding the Threat


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Two critical vulnerabilities have been identified in Microsoft SharePoint, labeled CVE-2025-53770 and CVE-2025-53771. Threat actors are actively exploiting these flaws in the wild. These vulnerabilities allow attackers to bypass authentication mechanisms and gain elevated privileges. This grants them unauthorized access to sensitive SharePoint sites and data.


By leveraging these vulnerabilities, attackers can impersonate users. They can escalate their permissions and potentially deploy additional payloads. This leads to further compromise of an organization’s network.


How the Vulnerabilities Work


The vulnerabilities exploit specific flaws in SharePoint's authentication process and token validation. This enables adversaries to craft specially designed requests. These requests trick the system into granting elevated access. Security researchers discovered that once initial access is gained, attackers often establish persistence within the compromised environment. This allows for ongoing data exfiltration and lateral movement across networks.


This situation poses significant risks to businesses relying on SharePoint for collaboration and document management. This is particularly true when those environments are not fully patched or monitored.


Recommended Defensive Measures


To defend against these exploits, organizations are urged to apply the latest security patches released by Microsoft immediately. Beyond patching, security teams should enhance their monitoring of SharePoint environments. They should look for signs of unusual activity or privilege escalation.


Implementing multi-factor authentication is crucial. Limiting the use of highly privileged accounts is also recommended. Regularly reviewing access permissions can further reduce the risk of exploitation. These strategies are essential to safeguard critical business data stored in SharePoint systems.


The Importance of Regular Updates


Keeping software up to date is vital for security. Regular updates help protect against known vulnerabilities. Organizations should establish a routine for checking and applying patches. This practice can significantly reduce the risk of exploitation.


Monitoring and Response


Effective monitoring is key to identifying potential threats. Organizations should invest in tools that provide real-time alerts for suspicious activity. A rapid response plan is also essential. This plan should outline steps to take if a breach is detected.


Conclusion


The vulnerabilities CVE-2025-53770 and CVE-2025-53771 present serious risks to SharePoint users. It is crucial for organizations to act swiftly. By applying patches and enhancing security measures, they can protect their sensitive data.


You can read more about this threat via Trend Micro Research.

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