Akamai has issued a warning about a significant security vulnerability in the Active Directory system of Windows Server 2025, which could allow unauthorized users to extend their access rights. This vulnerability, referred to as "BadSuccessor," concerns a feature known as "delegated Managed Service Accounts" (dMSA), implemented by Microsoft in this version.
The issue arises from the default configurations of the dMSAs, making it relatively easy for attackers to exploit. Akamai’s analysis reveals that this vulnerability affects a vast majority of organizations using Active Directory—91% of the environments reviewed had user accounts with sufficient rights to execute an attack.
Although Microsoft is aware of the problem and is planning a fix, a patch has not yet been released. In the meantime, IT administrators are advised to proactively mitigate risks by limiting dMSA creation rights solely to trusted administrators. Akamai has made available a Powershell script that identifies all principals with authorization to create dMSAs, along with their respective organizational units.
The attack vector is notably concerning because it allows attackers to seize control of any principal within a domain that employs dMSAs, even if those accounts aren’t being actively utilized within the network. The mere presence of a Windows Server 2025 on a network could provide a foothold for exploitation.
For those wanting to safeguard their systems, implementing the recommended measures is critical until a definitive solution is released by Microsoft.
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