CVE-2026-70583: Windows Core Messaging Elevation of Privilege Vulnerability

Overview

Severity

N/A

Exploit Status

Not Exploited

Exploitation Likelihood

More Likely

Patch Tuesday

2026-Sep

Released

2026-09-08

Last Updated

2026-10-16

EPSS Score

0.33% (percentile: 25.4%)

Description

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges locally.

FAQ

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Acknowledgments

<a href="https://twitter.com/ezrak1e">Ezrak1e</a>, pwn2addr, <a href="https://mylostchristmas.tistory.com/20">Seung Chan Kim</a>, Anonymous

Revision History

• 2026-09-08: Information published.
• 2026-10-16: Updated an acknowledgement. This is an informational change only.