Information disclosure in Microsoft Windows and Windows Server - CVE-2026-42907

Vulnerability identifier: #VU134418

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-42907

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in Windows Shell. A remote user can gain unauthorized access to sensitive information on the system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7417, 10 22H2 10.0.19045.7417, 10 1607 10.0.14393.9234, 10 1809 10.0.17763.8880, 11 23H2 10.0.22631.7219, 11 24H2 10.0.26100.8655, 11 25H2 10.0.26200.8655, 11 26H1 10.0.28000.2269
Windows Server - addressed in versions 2019 10.0.17763.8880, 2022 10.0.20348.5256, 2025 10.0.26100.8655, 2025 10.0.26100.32995

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42907

• Multiple vulnerabilities in Microsoft Windows Shell