The most common mistake is storing the recovery code in the same place as the second factor or leaving it in an unsecured location. That defeats the purpose of the code, because the backup becomes as vulnerable as the primary factor. Recovery material should be protected, separate, and available when a phone, app, or security key is lost.
What users usually misunderstand about recovery codes
Recovery codes are a fallback authenticator, so the main mistake is treating them like a convenience item instead of a separate control. If the code is saved beside the phone, authenticator app, password manager, or browser profile, it fails to restore access after the original factor is lost. The code needs a different storage path and a different failure mode.
That distinction matters because recovery material is only useful when the primary factor is unavailable. If it is stored in the same account, device, or cloud sync location as the factor it is meant to replace, a single compromise can eliminate both the primary and fallback paths at once.
In practice, the safer model is to treat recovery codes like other sensitive authentication material: keep them offline or in a protected location, and make sure the storage choice still works during device loss, account recovery, or lockout.
Why “same place as the second factor” is the wrong design
A recovery code is not meant to be easy to reach from the same environment that already protects the second factor. Users often save it in a notes app, a synced screenshot, or the same password manager vault they rely on for everyday login. That creates a single point of failure, because compromise of the storage location usually exposes both the live factor and the backup.
The better mental model is separation by purpose and by compromise path. The second factor protects routine logins, while the recovery code protects the rescue path. If both are protected by the same device unlock, same cloud account, or same signed-in session, the backup can be defeated by the same attack or the same lost device event.
This is also why recovery codes should be treated as one-time or limited-use material, not as a permanent substitute for the second factor. Once they are exposed, copied, or casually shared, they lose their value as an emergency fallback.
How to store recovery codes so they still work when needed
Useful storage choices are the ones that remain available after the original authenticator is gone. For many users, that means printing the code or writing it down and storing it separately from the device used for daily access. For others, it means placing it in a secure vault or offline location that is not tied to the same login path as the second factor.
If you need a concise rule: the recovery code should survive loss of the phone, loss of the authenticator app, or loss of the security key without also surviving an attacker who has already reached the same account or device. That is the balance to test.
There is also a visibility problem. People often do not know where the code was stored until they need it, which turns a recovery control into an availability problem. A good practice is to keep only one or two clearly documented recovery locations, not a scattered set of copies that nobody can verify later.
Risk and Threat Considerations
Recovery codes fail when they are stored in the same compromise domain as the primary second factor, because the backup then becomes reachable through the same stolen device, cloud session, or account access. That creates a direct takeover path instead of a resilient fallback.
Failure mechanism: An attacker, malware, or even routine device loss can expose both the live authenticator and the stored recovery code when the code is kept in synced notes, screenshots, shared folders, or the same password vault as the second factor.
Impact: The user can be locked out when they most need recovery, or the attacker can use the recovery code to bypass the second factor entirely and take over the account.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 and OWASP Agentic AI Top 10 address the attack and risk surface, while CIS Controls v8, NIST CSF 2.0 and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | 6 — Access Control Management | Separate and protect recovery material to reduce unauthorized access paths. |
| Recommendation — Store recovery codes separately and restrict who can access the fallback path. | ||
| NIST CSF 2.0 | PR.AA — Identity Management, Authentication, and Access Control | Recovery codes are part of authentication resilience and account access recovery. |
| Recommendation — Treat recovery codes as an authentication recovery control and keep them outside the primary factor path. | ||
| NIST SP 800-63 | 6 — Authenticator Lifecycle Management | Recovery codes support account recovery and must be handled as lifecycle-managed authenticator material. |
| Recommendation — Manage recovery codes with the same care as other authenticators and protect their issuance, storage, and replacement. | ||
| OWASP Non-Human Identity Top 10 | NHI-03 — Secrets Sprawl and Exposure | Recovery codes are secret-like fallback material that must not be stored in exposed or duplicated locations. |
| Recommendation — Keep recovery codes out of the same storage locations used for everyday authentication secrets. | ||
| OWASP Agentic AI Top 10 | A3 — Identity and Privilege Abuse | If recovery material is exposed, it can be used to bypass authentication and gain account access. |
| Recommendation — Protect recovery codes from reuse as an alternate access path by an attacker. | ||
Practitioner Guidance
What to verify: Check whether the recovery code is stored in a different trust boundary from the second factor, not just a different file or folder. If the backup depends on the same account session, same cloud sync, or same unlocked device, it is not a true fallback.
Common mistake: Users often optimize for convenience and forget the recovery scenario. A screenshot, synced note, or saved browser file may be easy to find, but it is usually too easy for an attacker or too dependent on the same lost device.
Practitioner takeaway: A recovery code only earns its name if it survives the failure of the primary factor while remaining harder to steal than the primary factor itself.
Related resources from NHI Mgmt Group
- What do security teams get wrong about two factor authentication for social media accounts?
- What do teams get wrong about keeping up with changing compliance requirements?
- What do teams get wrong about modern enterprise authorization when they rely on simplistic role models?
- What do teams get wrong when preparing users for a bulk identity migration?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 19, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
