Microsoft Sharepoint Server — CVE-2026-58644 (Critical)
Critical vendor advisory
CVE-2026-58644
Summary
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Why it matters
This CVE carries a CRITICAL severity rating (CVSS 9.8) in Microsoft Sharepoint Server. Patch or mitigate promptly. EPSS percentile: 68%.
Operator check
Review CVE-2026-58644 in your asset inventory. Apply patches per vendor guidance and verify Sharepoint Server is not exposed. CVSS score: 9.8. EPSS probability: 1.3%; percentile: 68%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.