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"vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32690)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Windows Server 2025 (Server Core installation)", "source": "cna", "vendor": "Microsoft"}, "product": "windows_server_2025_(server_core_installation)", "vendor": "microsoft"}], "analysis": {"en": {"generated_at": "2026-04-14T19:51:42.642684+00:00", "value": {"mitigation_remediation": ["Download and install the latest Microsoft security update that addresses CVE-2026\u201127912 from the Microsoft Security Response Center. The update guide can be found at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27912.", "Restart the affected Windows Server systems after the update to complete installation.", "Verify that the update has been successfully applied by checking the update history or confirming the presence of the mitigation through the update guide."], "summary": {"action": "Apply Patch", "impact": "Privilege escalation via Windows Kerberos authentication"}, "threat_synthesis": {"affected_systems": "Microsoft Windows Server operating systems from 2012 through 2025, including the 23H2 edition, and both full and Server\u2011Core installations, are affected. All 64\u2011bit builds of these server products contain the vulnerable Kerberos component.", "description_and_impact": "The vulnerability is an improper authorization flaw in the Windows Kerberos authentication system that can let an attacker who is already authorized within a Windows domain increase privileges when communicating over adjacent networks. This weakness, classified as CWE\u2011285, means an adversary can gain higher privileges on the target network, potentially compromising the confidentiality, integrity, and availability of any services that rely on Kerberos authentication.", "risk_and_exploitability": "The CVSS score of 8.0 indicates high severity. No EPSS data is available and the vulnerability is not listed in the CISA KEV catalog, suggesting no widespread exploitation has been reported. Attackers would need legitimate access within the same or an adjacent network and knowledge of Kerberos credentials to exploit this flaw, so the threat is primarily from authenticated insiders or compromised accounts. Until the vendor patch is applied, affected servers remain at risk of privilege escalation. "}}}}, "created": "2026-04-15T14:31:56.919256+00:00", "updated": "2026-04-15T14:45:03.399363+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows_server_2012", "microsoft$PRODUCT$windows_server_2012_(server_core_installation)", "microsoft$PRODUCT$windows_server_2012_r2", "microsoft$PRODUCT$windows_server_2012_r2_(server_core_installation)", "microsoft$PRODUCT$windows_server_2016", "microsoft$PRODUCT$windows_server_2016_(server_core_installation)", "microsoft$PRODUCT$windows_server_2019", "microsoft$PRODUCT$windows_server_2019_(server_core_installation)", "microsoft$PRODUCT$windows_server_2022", "microsoft$PRODUCT$windows_server_2022,_23h2_edition_(server_core_installation)", "microsoft$PRODUCT$windows_server_2025", "microsoft$PRODUCT$windows_server_2025_(server_core_installation)"]}