Microsoft COM for Windows Deserialization of Untrusted Data Vulnerability

Microsoft COM for Windows contains a deserialization of untrusted data vulnerability that allows for privilege escalation and remote code execution via a specially crafted file or script.

Published 5 Sep 2026Updated 5 Sep 202610 sources
CVSS 8.8 ✓ VERIFIED REFERENCE△ CISA KEV

What happened

Microsoft COM for Windows contains a deserialization of untrusted data vulnerability that allows for privilege escalation and remote code execution via a specially crafted file or script.

Affected versions

Windows: 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