Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)

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Summary

CVECVE-2026-55370
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 20:16:46 UTC
Updated2026-07-10 21:16:55 UTC
DescriptionLogto 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

EPSS: 0.001990000 probability, percentile 0.098460000 (date 2026-07-11)

Problem Types: CWE-294 | CWE-294 CWE-294: Authentication Bypass by Capture-replay

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Logto-io Logto affected < 1.41.0 Not specified

References

ReferenceSourceLinkTags
github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82 [email protected] github.com
github.com/logto-io/logto/pull/9109 [email protected] github.com
github.com/logto-io/logto/releases/tag/v1.41.0 [email protected] github.com
github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374 [email protected] github.com
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