What do security teams get wrong about improving sign-in security across every app and device?

Why This Matters for Security Teams

Teams often treat sign-in security as a single control problem when it is really a lifecycle problem. A stronger password, MFA, or conditional access policy can reduce account takeover risk, but it does not fix over-permissioned access, stale tokens, weak offboarding, or exposed service accounts that survive long after login. NHI Management Group’s Ultimate Guide to NHIs shows how widespread this gap is: 97% of NHIs carry excessive privileges, and 79% of organisations have experienced secrets leaks.

The mistake is assuming authentication is the finish line. Security teams need to connect sign-in controls to privilege design, secret rotation, and revocation processes, or they simply make the first step harder while leaving the rest of the path open. That gap is especially visible in hybrid estates where users, workloads, vendors, and automation all authenticate differently but are often governed with the same assumptions. In practice, many security teams discover the weakness only after a leaked credential, abused OAuth grant, or failed offboarding event has already expanded access.

Current guidance from NIST SP 800-53 Rev 5 Security and Privacy Controls supports a broader control view, not just login hardening, because identity assurance must be paired with access enforcement and accountability.

How It Works in Practice

Improving sign-in security across every app and device means treating identity as an end-to-end control plane. For human users, that usually starts with phishing-resistant MFA, device posture checks, and conditional access. For non-human identities, the answer is different: short-lived credentials, workload identity, scoped tokens, and revocation automation. The important point is that the control must continue after the user or workload is authenticated.

A practical program usually combines:

• phishing-resistant sign-in for humans, especially administrators and high-risk users;
• centralised identity governance so access reviews, approvals, and offboarding are consistent;
• secret discovery and rotation for API keys, certificates, and tokens;
• just-in-time access for privileged actions instead of permanent elevation;
• continuous policy checks so access decisions reflect device state, role, location, and risk.

For workloads and automation, static credentials are usually the weakest link. The Ultimate Guide to NHIs highlights how often secrets are stored outside proper vaults and how slowly they are revoked after exposure. That is why current best practice is moving toward ephemeral secrets and workload-centric identity, where a token is issued for a specific system, task, and duration rather than reused indefinitely.

Security teams should also map sign-in policies to authoritative controls such as account lifecycle, access enforcement, and authentication assurance. NIST guidance is clear that access management is not just about proving who signed in, but about proving they should still have that access at that moment. Organizations that separate login from lifecycle management often end up with strong front-door controls and weak internal containment.

These controls tend to break down when legacy applications cannot support modern federation or when device posture and app-level authorization are handled by separate teams with conflicting policies.

Common Variations and Edge Cases

Tighter sign-in controls often increase friction, so teams have to balance user experience against risk reduction. That tradeoff becomes sharper in environments with contractors, shared operational accounts, industrial systems, or older apps that cannot support modern single sign-on.

Best practice is evolving for these edge cases. For example, some environments still rely on local accounts or static API keys because replacement would require application refactoring. In those cases, the safer approach is not to pretend the risk is gone, but to layer compensating controls such as vaulting, short TTLs, network restriction, and alerting on unusual use. The same logic applies to third-party access: the State of Non-Human Identity Security found that 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, which means sign-in controls alone cannot explain who is actually connected.

One more common failure is over-applying human access patterns to machine identities. A person can be prompted, challenged, or blocked; a workload needs cryptographic proof, scoped trust, and automated revocation. For that reason, there is no universal standard for fully converged sign-in governance across every app and device yet, but the direction is clear: unify visibility, apply least privilege, and make access time-bound wherever possible.

Security teams that focus only on login strength usually find the real problem later, after credentials, tokens, or OAuth grants have already outlived the user or workload that obtained them.

Related resources from NHI Mgmt Group

• What do security teams get wrong about cyber resilience in identity-heavy environments?
• What do security teams get wrong about event based identity coordination?
• What do security teams get wrong about identity transformation programmes?
• What do security and compliance teams get wrong about document-free identity checks?