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Vulnerabilities / CVE-2026-56164

CVE-2026-56164

Published 2026-07-14 · Analyzed

CVE-2026-56164

Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

Exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-07-14, with a fix-by date of 2026-07-17. Patch it first.

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.

5.3 MEDIUM
CVSS 3.1 · CNA · microsoft.com
1.0%
chance of exploitation in the next 30 days (EPSS; higher than 63% of CVEs)

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Scores

Affected products

  • microsoft sharepoint server: < 16.0.19725.20434; 2016; 2019

Weakness: CWE-306

2 references (advisories, patches, write-ups)

Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.

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