ResetNightmare

ResetNightmare (CVE-2026-27912) is a validation flaw in the Kerberos Change Password protocol that allows for resetting the password of any target user/computer account, without knowing the current one. The attack requires an unpatched domain controller, and the ability to write a userPrincipalName (UPN) on any account you control. Alternatively, the vulnerability can also be abused by an attacker having the ability to create new users/computers in any OU, as creating a user/computer allows you to get GenericWrite permissions over it.

Blog: Identity Crisis: Novel Vulnerabilities Leading to Kerberos Downgrade, DoS, and Full Domain Takeover