---
cve: "CVE-2026-55370"
severity: "MEDIUM"
cvss: 6.4
epss: "20%"
vendor: "logto-io"
kev: false
exploited: false
published: "2026-07-10 20:16:46"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T16:49:04+02:00"
---

# CVE-2026-55370

> 6.4 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 9118867f6cbadc7291cf913beb4fede91ed5d374 (Commit)
- 91e55698a42f99438cd41ec2b16a1fc51dbdab8a (Commit)

## Referenzen

- <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/commit/9118867f6cbadc7291cf913beb4fede91ed5d374>
- <https://github.com/logto-io/logto/releases/tag/v1.41.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55370) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_