VULNERABILITY INTELLIGENCE

CVE-2026-55370

CVSS score6.4 MEDIUM
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-07-10
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Weakness classification

  • CWE-294: Authentication Bypass by Capture-replay

Primary references