CVE-2026-57098: Microsoft Remote Desktop App for Windows Information Disclosure Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Information Disclosure

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Sep

Released

2026-09-08

Description

Improper verification of cryptographic signature in Windows RDP Client allows an unauthorized attacker to disclose information over a network.

FAQ

What type of information could be disclosed by this vulnerability? An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.

Affected Products (1)

Windows

• Remote Desktop client for Windows Desktop

Security Updates (1)

• Release Notes

Acknowledgments

Zoltan Harmath with Microsoft

Revision History

• 2026-09-08: Information published.