Second-factor bypass via replayed TOTP codes
Published Aug 29, 2026 · Updated Aug 29, 2026
Authentication bypass in Rodauth before 2.47.0 allows remote attackers to replay a captured TOTP code and bypass the second factor. The otp feature checks codes across the configured otp_drift interval without recording the timestamp of the last accepted code, so a used value can pass again. Exposure requires the otp feature with nonzero drift and possession of a valid used code; the default 30-second drift creates a replay interval after initial acceptance.
Summary
What happened
Authentication bypass in Rodauth before 2.47.0 allows remote attackers to replay a captured TOTP code and bypass the second factor. The otp feature checks codes across the configured otp_drift interval without recording the timestamp of the last accepted code, so a used value can pass again. Exposure requires the otp feature with nonzero drift and possession of a valid used code; the default 30-second drift creates a replay interval after initial acceptance.
The record
- CVE
- CVE-2026-82470
- Published
- Aug 29, 2026
- Updated
- Aug 29, 2026
- Vendor
- Jeremy Evans
- Product
- Rodauth
- Classifications
- CWE-294, T1111
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 29, 2026CVE publishedPublication date reported by the CVE source.
- Aug 29, 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=0 <2.47.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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