CVE-2026-55370

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.

CVSS v3 6.4 MEDIUM

6.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374
https://github.com/logto-io/logto/pull/9109
https://github.com/logto-io/logto/releases/tag/v1.41.0
https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82

Configurations

No configuration.

History

10 Jul 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-10 20:16

Updated : 2026-07-13 19:21

NVD link : CVE-2026-55370

Mitre link : CVE-2026-55370

CVE.ORG link : CVE-2026-55370

JSON object : View

Products Affected

No product.

CWE

CWE-294

Authentication Bypass by Capture-replay

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