SB2026071633 - Multiple vulnerabilities in Microsoft Windows Server Update Service (WSUS)

Description

This security bulletin contains information about 2 vulnerabilities.

1) Missing Authentication for Critical Function (CVE-ID: CVE-2026-50444)

CWE-ID: CWE-306 - Missing Authentication for Critical Function

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 implemented security restrictions.

The vulnerability exists due to insufficient implementation of security measures in Windows Server Update Service (WSUS). A remote user can gain elevated privileges on the target system.

2) Uncaught Exception (CVE-ID: CVE-2026-50328)

CWE-ID: CWE-248 - Uncaught Exception

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

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to uncaught exception in Windows Server Update Service (WSUS). A remote attacker can perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50444
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50328