Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's existing TOTP verification accepted a successfully used TOTP code again while the code remained inside the RFC 6238 acceptance window because the verifier used otplib's stateless check with window = 1 and did not persist or compare the accepted TOTP time-step counter. An attacker who has the victim's first factor and captures a live TOTP value can replay that value to satisfy MFA during the same acceptance window. This issue is fixed in version 1.41.0.
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History
Fri, 10 Jul 2026 21:30:00 +0000
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ssvc
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Fri, 10 Jul 2026 20:00:00 +0000
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| Description | Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's existing TOTP verification accepted a successfully used TOTP code again while the code remained inside the RFC 6238 acceptance window because the verifier used otplib's stateless check with window = 1 and did not persist or compare the accepted TOTP time-step counter. An attacker who has the victim's first factor and captures a live TOTP value can replay that value to satisfy MFA during the same acceptance window. This issue is fixed in version 1.41.0. | |
| Title | Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation) | |
| Weaknesses | CWE-294 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-10T20:14:41.325Z
Reserved: 2026-06-16T18:57:40.181Z
Link: CVE-2026-55370
Updated: 2026-07-10T20:14:37.931Z
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