Cleartext transmission of sensitive information in Windows and Windows Server - CVE-2026-34346

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Main Vulnerability Database Vulnerabilities #VU137881

Cleartext transmission of sensitive information in Windows and Windows Server - CVE-2026-34346

Published: July 16, 2026


Vulnerability identifier: #VU137881
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34346
CWE-ID: CWE-319
Exploitation vector: Local access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server

Detailed vulnerability description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to software uses insecure communication channel to transmit sensitive information in Windows Ancillary Function Driver for WinSock. A local user can gain access to sensitive data.


How to mitigate CVE-2026-34346

Install updates from vendor's website.

Sources