CVE-2026-55370 | Logto is the modern, open-source auth infrastructure for Saa… | CVSS 6.4 MEDIUM

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.

Metadata

CVE ID: CVE-2026-55370
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 18:57 UTC
Published: 2026-07-10 19:56 UTC
Last updated: 2026-07-10 20:14 UTC
Primary CWE: CWE-294
CWE-294: Authentication Bypass by Capture-replay
Vendor / Product: logto-io / logto
Sources: cve.org · NVD

Severity & Metrics

6.4 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
logto-io	logto	—	< 1.41.0

Weakness (CWE)

CWE	Source	Description
CWE-294	cna	CWE-294: Authentication Bypass by Capture-replay

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.4	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

References (4)

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