Why do break glass accounts create both resilience and risk in privileged access management?

Why Break Glass Accounts Create a Resilience and Risk Trade-off

Break glass accounts exist because privileged access management has to survive the failure of its own dependencies. If MFA, a vault, conditional access, or an identity provider is unavailable during an outage or incident, an emergency account can keep critical systems reachable and shorten recovery time. That continuity benefit is real, but it comes from concentrating exceptional power in a small number of access paths that sit outside normal day-to-day controls.

That is why these accounts are not just “backup admin” accounts. They are an explicit exception to least privilege, strong authentication workflow, and often to normal approval flow. The more useful the account is in a crisis, the more damaging it can be if it is ever exposed, misused, or forgotten. NHI Management Group research on the Ultimate Guide to NHIs — Key Challenges and Risks shows how often organisations underestimate standing privilege and visibility gaps in identity estates, which is exactly the pattern emergency access can amplify.

In practice, many security teams discover the weakness only after the emergency path has already become the easiest path into production.

How Break Glass Access Works in Practice

A well-designed break glass account is usually reserved, documented, and separately protected from ordinary admin workflows. The purpose is not convenience; it is survivable access when the normal control plane has failed. That means it should be narrowly scoped, heavily monitored, and treated as an exceptional operational dependency rather than a routine login method.

In implementation terms, the account should solve a specific failure mode. If the organisation depends on a vault to retrieve credentials, the emergency process must still work when the vault is down. If MFA is the normal gate, the break glass path may need an alternate verifier, but that alternate path should be limited, auditable, and recoverable. This is where NHI governance becomes relevant, because emergency admin credentials are still machine-usable or human-usable privileged identities whose lifecycle must be controlled. The Ultimate Guide to NHIs is useful here because the same issues that affect service accounts also affect emergency privileged access: visibility, rotation, offboarding, and evidence of use.

• Use a unique account for the emergency path instead of repurposing a daily administrator login.
• Keep credentials offline or otherwise isolated from the systems they are meant to rescue.
• Require post-use rotation so the account does not remain a permanently valid fallback.
• Log every activation, including who approved it, why it was used, and what changed afterward.

The control breaks down when the account is designed as a permanent convenience layer, because then the exception becomes the standing control and bypasses the very PAM safeguards it was meant to supplement.

Common Variations and Edge Cases

Tighter emergency access often increases operational overhead, so organisations have to balance recovery speed against auditability and blast-radius reduction. That trade-off becomes more difficult in regulated environments, distributed cloud estates, and 24/7 operations where an outage can affect both revenue and safety.

One common edge case is whether a break glass account should be fully offline or simply excluded from normal SSO and MFA dependencies. Another is whether the account should be shared across a team or assigned to named custodians. Current guidance suggests named custodians are safer because accountability is clearer, but there is no universal standard for the exact custody model. What matters is that the organisation can prove who can activate the account, under what conditions, and how the credential is re-secured after use.

Teams also underestimate the difference between “rarely used” and “well governed.” An infrequently used emergency account can still be high risk if it is not tested, rotated, and observed. If the credential is long-lived, the vault is misconfigured, or the activation process is not rehearsed, the account may fail exactly when it is needed most. NHI Management Group’s Lifecycle Processes for Managing NHIs aligns with that reality because emergency access is only resilient when its lifecycle is explicit, not improvised.

Risk and Threat Considerations

Break glass accounts create a concentrated privilege exposure. They are attractive because they bypass normal friction, but that same bypass can be abused by insiders, stolen credentials, or an attacker who reaches the emergency path after compromise of supporting controls.

Failure mechanism: The risk materialises when an exceptional account is left valid for long periods, insufficiently monitored, or protected by weaker recovery logic than the rest of the identity stack. Attackers and malicious insiders do not need to defeat normal PAM if the emergency credential is easier to obtain, easier to reuse, or less visible in logs.

Impact: A single misuse event can create broad administrative access, undermine least privilege, and complicate forensic reconstruction because the access path was designed to be outside ordinary workflows. It can also turn a resilience feature into a persistence mechanism if the account is not rotated or revoked after use.

Practitioner Guidance

What to prioritise: Treat break glass design as a resilience control first and a privilege control second. The account should exist only for a defined failure condition, and the organisation should be able to name that condition without ambiguity.

What to verify: Confirm who can activate the account, how activation is approved, what monitoring captures the session, and how the credential is rotated immediately after use. If any of those steps are manual, rehearse them before an incident forces the first test.

Decision rule: If the emergency path can be used without a distinct post-use reset, it is not a true break glass control; it is an alternate standing admin path and should be treated as materially higher risk.

Practitioner takeaway: The goal is not to remove emergency access, but to make sure the exception is temporary, attributable, and harder to abuse than the outage it is meant to solve.

Related resources from NHI Mgmt Group

• Why does traditional break glass access create operational and compliance risk?
• Why do non-human identities create more audit risk than human accounts?
• When does JIT access create more risk than it reduces?
• Why does break-glass access create so much audit and compliance risk?