FKIE_CVE-2026-55370

Vulnerability from fkie_nvd - Published: 2026-07-10 20:16 - Updated: 2026-07-13 19:21
Severity
6.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374
security-advisories@github.comhttps://github.com/logto-io/logto/pull/9109
security-advisories@github.comhttps://github.com/logto-io/logto/releases/tag/v1.41.0
security-advisories@github.comhttps://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "logto",
          "vendor": "logto-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.41.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto\u0027s 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\u0027s stateless check with window = 1 and did not persist or compare the accepted TOTP time-step counter. An attacker who has the victim\u0027s 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."
    }
  ],
  "id": "CVE-2026-55370",
  "lastModified": "2026-07-13T19:21:55.683",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55370",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-10T20:14:33.407390Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-10T20:16:46.333",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/pull/9109"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/releases/tag/v1.41.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-294"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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