TL;DR: December 2025 incidents showed that valid credentials, tokens, and service accounts let attackers bypass perimeter controls, persist quietly, and monetize later across supply chain, insider, and ransomware cases, according to Delinea Labs’ January 2026 threat outlook. Static authentication assumptions are failing because trusted access now behaves like attack infrastructure, not a one-time check.
Editorial analysis by NHI Mgmt Group, based on content published by Delinea: “Credential theft at scale: How identities were used maliciously”.
Key questions
Q: What breaks when attackers find credentials after initial access?
A: The breach stops being about the first entry point and becomes about reachable privilege.
Q: Why do service accounts and tokens create more risk than many teams expect?
A: Because they often carry standing privilege, operate quietly, and remain valid long after the business need changes.
Q: How do teams know if identity security controls are actually working?
A: Identity security controls are working when teams can show a current view of high-risk entitlements, detect privilege drift quickly, and remove access before exposure spreads.
Practitioner guidance
- Audit orphaned and stale access Identify employee, contractor, and former-worker accounts that still have production access, then confirm whether revocation actually removed every token, grant, and downstream session.
- Inventory non-human identities end to end Build a single inventory for service accounts, CI/CD identities, OAuth grants, and application tokens so ownership, scope, and expiry are visible in one place.
- Correlate authenticated behaviour across identity types Use detection logic that links user, token, and service-account activity so a legitimate login followed by unusual distribution, publishing, or lateral movement is visible.
Bottom line: Valid credentials are now a primary attack path, which means authentication success no longer proves legitimate intent.
Explore further
View Full Forum → | NHI Foundation Course → | Our Services → | Read the full analysis →
Authentication has shifted from a gate to an attack surface: the old assumption was that successful login signified legitimate use, but December’s incidents show that authentication can now be the attacker’s operating environment. Once valid credentials are stolen, many security stacks still treat the session as trusted until after damage is done. Practitioners should therefore evaluate identity controls by what happens after authentication, not by whether authentication succeeded.
A question worth separating out:
Q: What is the difference between authenticating a user and governing a session?
A: Authentication answers whether the identity can prove who it is at a point in time. Session governance answers whether that access should continue, what it can reach, and whether the activity still matches the intended scope. In this threat pattern, the second control is what limits damage after credentials are stolen.
👉 Read our full editorial: Credential theft at scale shows authentication became the attack vector