Executive brief
A vulnerability in the Windows Server Update Service (WSUS) allows an unauthorized attacker to execute malicious code over the network. WSUS is a critical infrastructure component used by IT administrators to manage and distribute software updates across corporate networks. If exploited, an attacker could gain control over the update process, potentially compromising numerous connected systems or causing significant operational disruption.
Technical details
A remote code execution vulnerability exists in Windows Server Update Service (WSUS) due to improper input validation (CWE-20). The vulnerability can be exploited over the network without prior authentication, though the attack complexity is rated as high, suggesting specific environmental conditions or timing may be required. An attacker who successfully exploits this flaw could execute arbitrary code in the context of the WSUS service. Microsoft has released security updates to address this issue across affected versions of Windows and Windows Server.
Affected products
- Microsoft Windows Server Update Service (WSUS) Windows 10, Windows 11, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022
Timeline
- 2026-01-13: advisory: Initial disclosure by Microsoft and NVD