CVE-2026-56164ModerateExploitedCISA KEV · due 17 Jul
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Listed in the CISA Known Exploited Vulnerabilities catalog
Added 14 Jul 2026 · federal remediation due 17 Jul 2026.
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
Assessment
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
- Severity
- Moderate
- CVSS base score
- 5.3CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:N/ S:U/ C:N/ I:L/ A:N/ E:F/ RL:O/ RC:C - Impact
- Elevation of Privilege
- EPSS, next 30 days
- 1.0%Higher than 61.7% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation detected
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Office SharePoint
- Weakness
- CWE-306: Missing Authentication for Critical Function
- Issued by
- Microsoft
- Published
- 14 Jul 2026 · July 2026
- Last revised
- 14 Jul 2026
Updates that fix it
3 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5002882 | Security Update | — | Microsoft SharePoint Server Subscription Edition | All CVEs in KB5002882 |
| KB5002883 | Security Update | — | Microsoft SharePoint Server 2019 | All CVEs in KB5002883 |
| KB5002891 | Security Update | — | Microsoft SharePoint Enterprise Server 2016 | All CVEs in KB5002891 |
Affected products
Microsoft Office3 affected products
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition