CVE ID
CVE-2026-56164
Vulnerability Name
Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability
- Project: Microsoft
- Product: SharePoint Server
Date
- Date Added: 2026-07-14
- Due Date: 2026-07-17
Description
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
Known To Be Used in Ransomware Campaigns?
Unknown
Action
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.
Additional Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56164 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56164
Related Security News
- Another SharePoint RCE exploited: Patch, then rotate your machine keys (CVE-2026-50522)
- Critical SharePoint RCE CVE-2026-50522 Under Active Exploitation After Public PoC
- CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV
- Researcher Drops New Windows Zero-Day PoC Hours After Microsoft Patch Tuesday
- CISA warns admins to patch actively exploited SharePoint flaws
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