# CVE-2026-69414 — Microsoft Malware Protection Engine

> As of 2026-10-08, CVE-2026-69414 is a HIGH-severity vulnerability in Microsoft Malware Protection Engine, CVSS v3.1 7.8, EPSS 0.3% (23.7th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-69414, most recently “Microsoft September 2026 Patch Tuesday — 999 CVEs, 3 actively exploited zero-days (CVE-2026-85880, CVE-2026-81963, CVE-2026-85046)”.

**Last updated:** 2026-10-08

## What is CVE-2026-69414?

Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as "ShieldBreak ".

The record classifies CVE-2026-69414 under weakness classes [CWE-284](https://intel.threadlinqs.com/cwe/CWE-284), [CWE-269](https://intel.threadlinqs.com/cwe/CWE-269). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 72 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 23.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-14, last modified 2026-10-08

## Is CVE-2026-69414 being exploited?

Weaponised exploit code for CVE-2026-69414 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

- [1neptune/ShieldBreak](https://github.com/1neptune/ShieldBreak) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-69414.md) (trickest)

## Affected products and versions

- [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): Malware Protection Engine

## How to fix CVE-2026-69414

No vendor patch reference has been recorded for CVE-2026-69414 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-69414

2 tracked threats in the Threadlinqs corpus reference CVE-2026-69414, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Microsoft September 2026 Patch Tuesday — 999 CVEs, 3 actively exploited zero-days (CVE-2026-85880, CVE-2026-81963, CVE-2026-85046)](https://intel.threadlinqs.com/threat/TL-2026-2407) — CRITICAL · 2026-09-08
- [FalconFlank: Unpatched Local Privilege Escalation PoC in CrowdStrike Falcon Sensor via Office Macro Remediation](https://intel.threadlinqs.com/threat/TL-2026-2330) — HIGH · 2026-09-04

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69414)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-69414
Full detection coverage and IOCs for threats exploiting CVE-2026-69414 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp