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CVE-2026-55370— Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)

CVSS 6.4 · Medium EPSS 0.20% · P10

Affected Version Matrix 1

VendorProductVersion RangeStatus
logto-iologto< 1.41.0affected
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I. Basic Information for CVE-2026-55370

Vulnerability Information
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Vulnerability Title
Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
logto-iologto < 1.41.0 -

II. Public POCs for CVE-2026-55370

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III. Intelligence Information for CVE-2026-55370

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Patches & Fixes for CVE-2026-55370 (2)

Vendor Advisories for CVE-2026-55370 (1)

Vendor Pages for CVE-2026-55370 (1)

Same Patch Batch · logto-io · 2026-07-10 · 4 CVEs total

CVE-2026-557898.5 HIGHLogto: SAML IdP injects user-controlled profile attributes raw into signed assertions, all
CVE-2026-553778.1 HIGHLogto: Account Center MFA management step-up bypass via WebAuthn registration verification
CVE-2026-547146.1 MEDIUMLogto: XSS via unescaped RelayState in SAML auto-submit form

IV. Related Vulnerabilities

Same product: logto
Same vendor: logto-io
Same weakness: CWE-294

V. Comments for CVE-2026-55370

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