SB2026071722 - Multiple vulnerabilities in Microsoft Windows Admin Center (WAC)

Description

This security bulletin contains information about 3 vulnerabilities.

1) Path traversal (CVE-ID: CVE-2026-56196)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in Windows Admin Center (WAC). A remote user can send a specially crafted HTTP request and read arbitrary files on the system.

2) Improper Authorization (CVE-ID: CVE-2026-58631)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to improper authorization in Windows Admin Center (WAC). A remote user can execute arbitrary code on the target system.

3) Command Injection (CVE-ID: CVE-2026-56197)

CWE-ID: CWE-77 - Command injection

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to execute arbitrary commands on the system.

The vulnerability exists due to insufficient input validation in Windows Admin Center (WAC). A remote user can pass specially crafted data to the application and execute arbitrary commands.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56196
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58631
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56197