Vulnerability details
CVE-2026-64921
Microsoft SharePoint Enterprise ServerMicrosoft SharePoint Server
Microsoft SharePoint Server Elevation of Privilege Vulnerability
CVSS 3.1
8.8High
Official description
Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 ≤ v < 16.0.5565.1001 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 ≤ v < 16.0.10417.20198 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 ≤ v < 16.0.19725.20522 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64921 vendor-advisorypatch
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Details
- Published
- 2026-08-11
- Last updated
- 2026-10-30
- State
- Published
- Assigner (CNA)
- microsoft
Exploit prediction (EPSS)
0.94%
Probability of exploitation in 30 days
61%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306Missing Authentication for Critical Function