Passkey Security Risks and How to Reduce Them

Consider a distribution center that moves its shift supervisors from passwords to passkeys. Reset tickets fall, phishing simulations stop landing, and the rollout looks like a clean win. Then a supervisor loses the phone holding her passkey halfway through a Saturday night shift, and the only way back into her account runs through a help desk call that anyone with her name and employee ID could place.

That gap between strong sign-in and weak surrounding processes is where most passkey security risks show up today. The FIDO Alliance’s State of Passkeys 2026 report found that 68% of organizations have deployed or are deploying passkeys for employee sign-ins, yet only 28% have reached fully passwordless workforce authentication, and 57% still rely on phishable methods for daily sign-in.

Passkey security risks are the weaknesses in the enrollment, sync, recovery, endpoint, and validation processes that surround a passkey, which attackers exploit to gain access without breaking the passkey’s cryptography. For organizations where workers share terminals, scanners, and kiosks across shifts, those surrounding processes carry even more weight, because the device rarely belongs to one person.

This guide covers how passkeys resist attacks, how storage shapes risk, seven passkey security risks to plan for, why shared devices raise the stakes, and a hardening checklist.

Why Passkeys Resist Phishing and Credential Theft

A passkey uses a public and private key pair. The service stores only the public key, while the private key stays on the user’s device or in a synced credential manager. During sign-in, the device signs a one-time challenge after the user verifies with a fingerprint, face scan, or PIN.

Three properties make this model strong. The passkey binds to the website’s origin, so a lookalike domain cannot request a valid signature. The server holds no shared secret, so a database breach exposes nothing an attacker can reuse. And attackers cannot guess, spray, or stuff a private key the way they attack passwords.

Those strengths explain why passkey security risks now come from everything around the passkey. With Microsoft making passkeys the default for Entra ID sign-in from September 2026, that surrounding attack surface now sits in front of a large share of enterprise identities.

Synced vs Device-Bound Passkeys and How Storage Changes Your Risk

Device-bound passkeys are tied to a specific authenticator, such as a hardware security key or a platform authenticator configured to keep the credential bound to the device. They are designed to prevent credential export or synchronization to other devices.

Synced passkeys, by contrast, are stored in a credential manager and can become available across multiple devices through a cloud account.

This portability improves usability and recovery, but it introduces additional dependencies on the security of the credential manager, the user's cloud account, and the devices accessing the credential.

The choice between synced and device-bound passkeys should reflect the organization's risk profile, user population, and recovery requirements rather than a blanket assumption that one model is always appropriate.

7 Passkey Security Risks Enterprises Should Plan For

In 2026, researchers published dozens of techniques against passkey deployments, and one industry roundup counted at least 39 publicly documented methods. None of them break FIDO2 cryptography. These passkey security risks cluster into seven areas.

1. Enrollment and Re-Enrollment Abuse

An attacker who gains a foothold in an account can register a passkey on their own device instead of stealing the user’s. This shadow passkey survives password changes and session resets, giving the attacker persistent access. Help desk social engineering, weak identity proofing during onboarding, and hijacked sessions all open this door. Security teams rank it among the highest-impact passkey security risks because one approved registration hands over the account long term.

2. Weak Account Recovery and Fallback Methods

Many deployments keep SMS codes, email links, or help desk overrides as a safety net. Attackers route around the passkey and target the fallback through SIM swaps, mailbox compromise, or a convincing call to support. Every passkey rollout inherits the strength of its weakest recovery path.

3. Synced Passkey Exposure Through Cloud Account Takeover

Palo Alto Networks Unit 42 demonstrated three Pass-ta-key techniques against Google-synced passkeys in Chrome on Windows. With malware already on the device, attackers could take over accounts without user interaction, bypass biometric verification, and, in the Golden variant, extract every synced passkey in a form they could share or sell. The serious techniques started by forcing a device to re-enroll into the sync system.

4. Malware on the Endpoint and Passkey Replay Attacks

At Black Hat USA 2026, SpecterOps presented Pass-the-Passkey, a family of more than 20 techniques. One chain harvested signed WebAuthn assertions that Windows 11 retained in its event logs and replayed them to Microsoft Entra ID, which accepted them. The result was privileged-user impersonation that still satisfied a phishing-resistant MFA policy, while the private key never left the authenticator. The issue is tracked as CVE-2026-34348.

5. Server-Side Validation Failures

A passkey stays strong only when the service checks every part of the response. Researchers found services that skipped the user verification flag, accepted reused challenges, failed to bind challenges to sessions, or ignored signature counters. Each gap lets an attacker replay or forge a ceremony the cryptography would otherwise reject. These passkey security risks sit entirely on the service side, so no user behavior can fix them.

6. Session Hijacking After a Successful Passkey Login

A passkey protects the sign-in moment and nothing after it. Adversary-in-the-middle kits and infostealers steal the session cookie issued after authentication, and the attacker rides that session without touching the passkey.

7. Prompt Manipulation and Social Engineering

Once passkey prompts become routine, attackers can trigger, disguise, or time them. Real-time phishing pages and repeated legitimate-looking prompts push users to approve a ceremony for a session the attacker started. The credential works exactly as designed, for the wrong session.

Why Passkey Security Risks Grow on Shared Devices and Frontline Workstations

Most passkey guidance assumes one person, one phone, and one laptop. A warehouse RF scanner, a retail POS terminal, or a manufacturing HMI may serve dozens of workers across three shifts, and several risks compound in that setting:

• Synced passkeys tie to personal Apple or Google accounts, which do not belong on a shared terminal and leave the organization with no control over the credential.
• Workers without company phones have nowhere to hold a passkey, so teams fall back to shared logins or PINs, the exact credentials passkeys were meant to replace.
• Recovery requests spike at shift change, when help desks face pressure to approve resets quickly, which makes enrollment abuse easier.
• Many users authenticating on one shared Windows endpoint can leave authentication artifacts on that single machine, so one compromised kiosk exposes many identities at once.
• Sessions left open between workers blur who did what, which weakens audit trails even without an attacker involved.

The challenge is not simply whether a shared device can support passkey authentication. It is whether the organization can maintain a secure and attributable authentication lifecycle when multiple employees use the same endpoint.

For example, a retail associate may authenticate at a shared POS terminal, a warehouse worker may access a scanner at the start of a shift, or a healthcare professional may move between shared clinical workstations.

In these environments, organizations need to ensure that authentication establishes the identity of the individual worker, that sessions are isolated between users, and that access can be revoked or terminated without relying on a shared account or personal device.

These requirements should be considered alongside passkey deployment rather than treated as a separate operational concern.

OLOID focuses on this gap, giving frontline teams phishing-resistant sign-in through badge tap, face, or PIN on shared devices, with each session tied to a verified individual.

How to Reduce Passkey Security Risks: An Enterprise Hardening Checklist

Most passkey security risks trace back to process gaps, so these controls focus on what you can set during or after rollout.

• Lock down enrollment: Require an existing phishing-resistant authenticator to approve any new passkey, enforce attestation with an approved authenticator allowlist, and notify the user on every new registration.
• Close weak fallbacks: Remove SMS and voice codes for privileged accounts and require live identity proofing before any help desk reset.
• Validate everything on the server: Check the user verification flag, challenge uniqueness, session binding, and signature counters on every login.
• Set a synced vs device-bound policy: Allow synced passkeys for low-risk access and require device-bound keys for administrators and sensitive systems.
• Protect the session: Use token binding and continuous access evaluation, shorten session lifetimes, and revoke sessions on risk signals.
• Harden endpoints: Patch CVE-2026-34348, restrict who can read Windows event logs, and monitor for infostealers and browsers running with remote debugging enabled.
• Monitor enrollment events: Treat a burst of new passkeys on one account, or registrations from unfamiliar locations, as an incident.

Do Passkey Security Risks Outweigh the Benefits?

No. Passkeys remain a significant improvement over passwords for protecting workforce authentication.

They reduce exposure to phishing, credential stuffing, and password reuse. However, organizations still need to secure the processes that surround authentication, including credential enrollment, recovery, endpoint security, and authenticated sessions.

The most effective passkey strategies treat authentication as part of a broader identity security program rather than a standalone control.

For organizations with frontline workers and shared devices, that also means ensuring that every employee can authenticate securely, access the right applications, and maintain an individually attributable session. Passkeys strengthen workforce authentication. The next step is ensuring those protections extend across every employee, device, and workflow.

FAQs

1. Are passkeys safe to use?

Yes. Passkeys resist phishing and credential theft far better than passwords. Their safety depends on how the organization handles enrollment, recovery, and session protection around them.

2. Can passkeys be hacked or stolen?

Attackers cannot guess or phish the private key, but 2026 research showed that malware on a compromised device can replay assertions or extract synced passkeys from a credential manager.

3. Are synced passkeys less secure than device-bound passkeys?

Synced passkeys depend on the security of the cloud account that stores them, which adds exposure. Device-bound passkeys stay on one piece of hardware and resist extraction.

4. What happens if I lose the device that holds my passkey?

Synced passkeys restore on a new device through your credential manager. Device-bound passkeys require a backup authenticator or an account recovery process, which needs strong identity proofing.

5. What are the main disadvantages of passkeys?

The main drawbacks include recovery complexity, inconsistent support across platforms, reliance on personal devices, and new attack paths through enrollment, sync, and session handling.