Bottom line: A PoC exploit for a critical SharePoint vulnerability published by Rapid7 is already being actively exploited by attackers.
Shortly after security firm Rapid7 published a proof-of-concept exploit for a critical SharePoint vulnerability, attackers are already deploying it in real-world attacks. Affected organizations with exposed SharePoint servers are at acute risk.
Rapid7 published a proof-of-concept exploit (PoC) on Tuesday for a vulnerability classified as critical in Microsoft SharePoint. According to Bleeping Computer, attackers picked up this PoC immediately afterward and adapted it for their own attacks. The report at hand does not provide concrete technical details about the vulnerability, such as a CVE number or affected SharePoint versions.
For CISOs, the publication of a working PoC combined with already observed exploitation constitutes an immediate call to action. In many organizations, SharePoint servers are central collaboration platforms with access to sensitive documents, identities, and internal systems. A successful compromise can therefore serve as a gateway for further attacks on the entire infrastructure, for example for lateral movement or credential theft.
Security teams should promptly check whether their own SharePoint instances are affected by the vulnerability as soon as Microsoft or Rapid7 provide further details and a patch. Until then, increased monitoring of SharePoint systems for unusual access patterns is recommended, as well as checking whether external accessibility can be temporarily restricted. Once an official update is available, its deployment should be prioritized.
Source: www.bleepingcomputer.com · Published August 12, 2026
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