PT-2026-57281 · Logto Io · Logto

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-55370

Mitre

CVSS v3.1

6.4

Medium

Base vector

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

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.

Fix

Weakness Enumeration

CWE-294

Related Identifiers

CVE-2026-55370

Affected Products

Logto

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-55370 · Security Note
• https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374 · Note
• https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82 · Note
• https://github.com/logto-io/logto/releases/tag/v1.41.0 · Note
• https://github.com/logto-io/logto/pull/9109 · Note