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

Quick assessment

Affected
logto-io logto
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 1.41.0之前版本存在授权问题漏洞，该漏洞源于TOTP验证使用otplib的无状态检查且未持久化或比较接受的TOTP时间步计数器，导致在RFC 6238接收窗口内可重用已使用的TOTP代码，攻击者在拥有受害者第一因素并捕获实时TOTP值的情况下可重放该值绕过MFA。

CVSS 6.4 · Medium EPSS 0.34% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
logto-io logto < 1.41.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
logto-io logto 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 1.41.0之前版本存在授权问题漏洞，该漏洞源于TOTP验证使用otplib的无状态检查且未持久化或比较接受的TOTP时间步计数器，导致在RFC 6238接收窗口内可重用已使用的TOTP代码，攻击者在拥有受害者第一因素并捕获实时TOTP值的情况下可重放该值绕过MFA。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
logto-io logto < 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-2026-55789 8.5 HIGH Logto: SAML IdP injects user-controlled profile attributes raw into signed assertions, all
CVE-2026-55377 8.1 HIGH Logto: Account Center MFA management step-up bypass via WebAuthn registration verification
CVE-2026-54714 6.1 MEDIUM Logto: 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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