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High severity8.8NVD Advisory· Published Aug 11, 2026· Updated Aug 13, 2026

CVE-2026-66808

CVE-2026-66808

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Affected products

5
  • Microsoft/Sharepoint Server4 versions
    cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*+ 3 more
    • cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*range: <16.0.19725.20522
    • cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
    • cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
    • (no CPE)
  • Microsoft/Office SharePointllm-fuzzy

Patches

Vulnerability mechanics

References

1

News mentions

4