CVE-2026-45659

Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability
80.2%
EPSS
100%
Percentile
Yes
Known exploited
1
APAC news · 90d
Summary

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

Vendor
Microsoft
Product
SharePoint Server
Added to KEV
Jul 1, 2026
Remediation due
Jul 4, 2026 (US federal deadline)
Ransomware use
Known
Weakness
CWE-502
EPSS
80.2% as of Nov 12
In the news · last mention Nov 10
Linked
Actors named alongside it:
none
Incidents exploiting it:
  • none recorded