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

CVE-2026-70321

CVE-2026-70321

Description

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

Affected products

2

Microsoft/Office SharePointllm-fuzzy
Microsoft/Sharepoint Serverllm-create

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70321nvd

News mentions

2

Microsoft's August 2026 Patch Tuesday Addresses 398 CVEs (CVE-2026-68820)
Tenable Blog · Aug 11, 2026
Microsoft Patch Tuesday Update August 2026 – 394 Vulnerabilities Fixed, Including 3 Zero-Days
Cyber Security News · Aug 11, 2026