Why Active Directory Vulnerabilities Demand More Than a Patch
Summary: CVE-2026-25177 is a high-severity privilege escalation flaw in Microsoft Active Directory Domain Services, rated HIGH with a CVSS score of 8.8, that lets an authenticated domain user escalate privileges and move laterally without elevated starting permissions or user interaction. If a compromised account holds native AD permission to modify Service Principal Names, an attacker can create a duplicate SPN for a targeted service, and when clients request Kerberos authentication the domain controller may issue a ticket encrypted with the wrong key, causing a denial of service or forcing a fallback to the weaker NTLM protocol.
Bottom line: A single low-privilege account with SPN-write permission is enough to reach domain controllers, sensitive data stores, and ultimately administrative accounts, so the blast radius is domain-wide rather than one system. Patching all domain controllers is necessary, but the exposure lives in accumulated excessive permissions, ungoverned service accounts, and inconsistent configurations across multiple AD domains and Microsoft 365 tenants that a patch does not touch.
Read the original at The Hacker News ↗
- Topics
- Vulnerabilities & Patching
- Mentions
- CVE-2026-25177
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