Technology

Major Security Breach Hits SharePoint, Affects Over 10,000 Organizations

Major Security Breach Hits SharePoint, Affects Over 10,000 Organizations
Editorial
  • PublishedJuly 23, 2025

A serious security breach in Microsoft’s SharePoint platform has left over 10,000 organizations globally at risk, with a significant number based in the United States. The flaw, which allows unauthorized access to sensitive documents, has drawn the attention of cybersecurity experts, who warn that the vulnerability presents a prime opportunity for hackers, particularly ransomware operators.

According to reports from Bloomberg, the National Nuclear Security Administration (NNSA), the U.S. agency responsible for the nation’s nuclear arsenal, was among those compromised in the attack. While there is currently no evidence that classified information was accessed, the breach raises serious concerns about the security of sensitive government data.

Microsoft has indicated that there are “active attacks targeting on-premises servers.” Cybersecurity researchers estimate that the vulnerability affects a wide range of entities, including federal and state agencies. Silas Cutler, a researcher at cybersecurity firm Censys, stated, “It’s a dream for ransomware operators, and a lot of attackers are going to be working this weekend as well.”

Global Impact and Response

The breach has implications that extend beyond the U.S. According to Cutler, the largest concentration of affected organizations is in the U.S., followed by the Netherlands, the United Kingdom, and Canada. Security firms such as Palto Alto Networks and Google’s Threat Intelligence Group have labeled the risks as “serious” and “significant,” highlighting the potential for widespread disruption.

In response to the breach, Microsoft has released a security patch for SharePoint Subscription Edition. The company is also working on similar updates for SharePoint 2016 and 2019 versions. Despite these efforts, Eye Security, the firm that first identified the flaw, cautions that the patch may not be sufficient. They warn that hackers could exploit the vulnerability to maintain access through backdoors or modified components, even after updates.

Organizations using SharePoint are advised to adopt immediate precautions. Microsoft has provided guidance on steps to mitigate risks, but experts recommend that any sensitive documents stored on SharePoint be removed until the situation stabilizes.

Looking Ahead

As investigations continue, the full extent and implications of the breach remain uncertain. The situation underscores the importance of robust cybersecurity measures, particularly for organizations handling sensitive information. With hackers increasingly targeting vulnerabilities in widely-used platforms, it is crucial for businesses and government agencies alike to reassess their security protocols.

The attack on the National Nuclear Security Administration highlights the potential dangers posed by such cybersecurity breaches. While no classified information has been reported compromised, the incident serves as a stark reminder of the ongoing threats in the digital landscape. Organizations are urged to stay vigilant and proactive in safeguarding their data against future attacks.

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