What’s Vulnerable › Vulnerabilities

CVE-2026-88198: Microsoft Office SharePoint Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-26
• Weakness: CWE-862

Description

Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

Affected products

• Microsoft SharePoint Server: before 16.0.20326.20190 — fixed in 16.0.20326.20190
• Microsoft SharePoint Server: from 16.0.0 before 16.0.20326.20190 — fixed in 16.0.20326.20190

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server 16.0.20326.20190; Microsoft SharePoint Server 16.0.20326.20190. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88198

Get alerted when CVE-2026-88198 or the next vulnerability affects your stack