CVE-2026-56164
MEDIUM CISA KEV
ACT NOW
Priority: 0.05
BB Relevance:
71/100
Published: 2026-07-14
Modified: 2026-10-28
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
Low
A:
None
Description
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
CISA Known Exploited Vulnerability
Vendor / Product
Microsoft — SharePoint Server
Date Added
2026-07-14
Remediation Due
2026-07-17
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
Weakness Classification (1)
Affected Software (9)
| Vendor | Product | Version |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 < 16.0.5561.1001 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 < 16.0.5561.1001 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 < 16.0.10417.20175 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 < 16.0.10417.20175 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 < 16.0.19725.20434 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 < 16.0.19725.20434 |
| microsoft | sharepoint_server | < 16.0.19725.20434 |
| microsoft | sharepoint_server | 2016 |
| microsoft | sharepoint_server | 2019 |
References & Advisories (2)
vendor-advisory
patch
US Government Resource