CVE-2026-56164Microsoft SharePoint Server Elevation of Privilege Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft SharePoint Enterprise Server 2016 and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jul 14, 2026; federal agencies had to remediate by Jul 17, 2026. Treat that date as your deadline.
Do this next
Free account, 1 product
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C
- Weakness (CWE)
- CWE-306
- Known exploited
- Added to CISA KEV Jul 14, 2026; federal remediation due Jul 17, 2026Apply 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.
- EPSS (exploitation in the next 30 days)
- 1.01% (percentile 63)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft SharePoint Enterprise Server 2016 microsoft:sharepoint_enterprise_server_2016 (from the name) | from 16.0.0 before 16.0.5561.1001 | CNA record |
Microsoft Microsoft SharePoint Server 2019 microsoft:sharepoint_server_2019 (from the name) | from 16.0.0 before 16.0.10417.20175 | CNA record |
Microsoft Microsoft SharePoint Server Subscription Edition microsoft:sharepoint_server_subscription_edition (from the name) | from 16.0.0 before 16.0.19725.20434 | CNA record |
microsoft sharepoint_server microsoft:sharepoint_server | before 16.0.19725.20434; 2016; 2019 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.