Microsoft SharePoint Server Security Feature Bypass Vulnerability
Patch now. It under exploitation confirmed by CISA and has a working public exploit.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Microsoft SharePoint has a weak authentication flaw that lets attackers bypass security protections remotely. This means unauthorized people could gain access to protected data and features without proper verification.
A weak authentication mechanism in Microsoft Office SharePoint allows network-based attackers to circumvent security controls without valid credentials. The vulnerability enables unauthorized access to restricted resources and functionality, requiring only network connectivity to the affected SharePoint instance.