CVE-2026-21509 PoC — Microsoft Office Security Feature Bypass Vulnerability

Source

https://github.com/SimoesCTT/SCTT-2026-33-0007-The-OLE-Vortex-Laminar-Bypass-

Associated Vulnerability

Title: Microsoft Office Security Feature Bypass Vulnerability (CVE-2026-21509)
Description:Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.

Description

Microsoft just released emergency patches for CVE-2026-21509, a zero-day in the Office Suite that bypasses OLE/COM mitigations when a user simply opens a file. They think their "Service-side change" for Office 2021+ is a solid wall.

File Snapshot

Remarks

1. It is advised to access via the original source first.

2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.

View subscription plans →