Authentication bypass via identity comparison after deserialization
Published Aug 26, 2026 · Updated Aug 27, 2026
Improper authentication in Spring Security WebAuthn allows attackers with a user's authenticator to bypass required PIN or biometric checks. The WebAuthn ceremony compares a deserialized UserVerificationRequirement object to REQUIRED by identity, so the check evaluates false. Reachability requires WebAuthn with userVerification set to REQUIRED and a distributed HTTP session store; the default PREFERRED setting is unaffected, and possession of the user's authenticator is still required.
Summary
What happened
Improper authentication in Spring Security WebAuthn allows attackers with a user's authenticator to bypass required PIN or biometric checks. The WebAuthn ceremony compares a deserialized UserVerificationRequirement object to REQUIRED by identity, so the check evaluates false. Reachability requires WebAuthn with userVerification set to REQUIRED and a distributed HTTP session store; the default PREFERRED setting is unaffected, and possession of the user's authenticator is still required.
The record
- CVE
- CVE-2026-47841
- Published
- Aug 26, 2026
- Updated
- Aug 27, 2026
- Vendor
- Spring
- Product
- Spring Security
- Classifications
- CWE-287, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 26, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=6.4.0 <=6.4.18
- Affected versionversion=6.5.0 <=6.5.11
- Affected versionversion=7.0.0 <=7.0.6
- Affected versionversion=7.1.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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