CVE-2026-55370 – Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to …

Vuln ID: CVE-2026-55370

Published:  2026-07-10  20:16:46.333

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.

Base Score: 6.4 – MEDIUM

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

Source: NVD.NIST.GOV

 

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