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CVE-2026-45659: Microsoft SharePoint Server

EPSS2.7%No. 1537 of 1739 in KEV
CVE year2026listed the same year
Same vendor in KEV389
Same product5
FieldValue
VendorMicrosoft
ProductSharePoint Server
NameMicrosoft SharePoint Server Deserialization of Untrusted Data Vulnerability
Added to KEV2026-07-01
US federal due date2026-07-04
Ransomware useKnown
CWECWE-502

CISA description

Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.

Other entries for this product

CVEVendor / productAddedEPSSRansomware
CVE-2026-56164Microsoft SharePoint Server2026-07-141.0%Unknown
CVE-2026-32201Microsoft SharePoint Server2026-04-1443.3%Unknown
CVE-2023-24955Microsoft SharePoint Server2024-03-2684.9%Known
CVE-2023-29357Microsoft SharePoint Server2024-01-1099.9%Known

NVD — CVE-2026-45659

Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page

A Microsoft SharePoint Server vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-01.