Use of a broken or risky cryptographic algorithm in Windows Server - CVE-2026-20833

Vulnerability identifier: #VU121323

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-20833

CWE-ID: CWE-327

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to use of a broken or risky cryptographic algorithm in Windows Kerberos. A local user can gain access to sensitive information on the system.

Windows Server
Samba

Install updates from vendor's website.

Windows Server - addressed in versions 2008 R2 6.1.7601.28117, 2008 6.0.6003.23717, 2012 R2 6.3.9600.22968, 2012 6.2.9200.25868, 2016 10.0.14393.8783, 2019 10.0.17763.8276, 2022 23H2 10.0.25398.2092, 2022 10.0.20348.4648, 2025 10.0.26100.7623, 2025 10.0.26100.32230
Samba - update to 4.24.0

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833

• Multiple vulnerabilities in Microsoft Windows Kerberos
• Use of a broken or risky cryptographic algorithm in Samba