Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability

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

Published 11 Sep 2026Updated 11 Sep 20264 sources
CVSS 8.8 PoC CANDIDATE△ CISA KEV

What happened

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

Affected versions

SharePoint Server: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references