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CVE-2026-108452: Microsoft Office SharePoint Remote Code Execution Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-31
• Weakness: CWE-22

Description

Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Affected products

• Microsoft SharePoint Server: before 16.0.20326.20190 — fixed in 16.0.20326.20190
• Microsoft SharePoint Server Subscription Edition: 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 Subscription Edition 16.0.20326.20190. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108452

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