A critical vulnerability identified as CVE-2026-26119 has been discovered in Windows Admin Center (WAC), allowing potential privilege escalation. The flaw, categorized under CVSS with a score of 8.8, originates from inadequate authentication processes, potentially enabling attackers with existing access to increase their network privileges.
Impact on Affected Systems
Microsoft reports that the vulnerability impacts version 2.6.4 of Windows Admin Center, with public disclosure occurring on February 17, 2026. This flaw allows attackers with minimal privileges to elevate their access without needing further user interaction, which could lead to significant control over the system.
Despite no current reports of active exploitation, Microsoft cautions that the vulnerability is likely to be targeted due to its low attack complexity and the extensive network exposure of WAC deployments. Successful exploitation could grant the attacker equivalent privileges to the user operating the vulnerable application.
Potential Risks and Mitigation
The widespread usage of Windows Admin Center for centralized system management means that such privilege escalation could potentially allow full control over managed servers, alteration of system configurations, and unauthorized access to sensitive information. Microsoft has released a security update to address the issue and strongly recommends administrators implement the patch immediately.
This vulnerability was responsibly reported by Andrea Pierini from Semperis, and Microsoft has made the patch available through its official release channels, including detailed release notes and security updates.
Preventive Measures and Future Outlook
Although no proof-of-concept (PoC) code has been made public, the exploitability index suggests a heightened chance of future exploit development. Given the exposure of Windows Admin Center in enterprise settings, delaying patch application could leave systems susceptible to lateral movement and privilege abuse attacks.
Administrators are urged to adhere to Microsoft’s security update guidelines, reassess account permissions, and diligently monitor event logs for any unusual privilege escalation activities. Additional information on this vulnerability can be accessed through CVE.org and Microsoft’s Security Update Guide.
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