CVE-2026-55370 (GCVE-0-2026-55370)
Vulnerability from cvelistv5 – Published: 2026-07-10 19:56 – Updated: 2026-07-10 20:14
VLAI
EPSS
VEX
Title
Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)
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.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 20:14 UTC
CWE
- CWE-294 - Authentication Bypass by Capture-replay
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/logto-io/logto/security/adviso… | x_refsource_CONFIRM |
| https://github.com/logto-io/logto/pull/9109 | x_refsource_MISC |
| https://github.com/logto-io/logto/commit/9118867f… | x_refsource_MISC |
| https://github.com/logto-io/logto/releases/tag/v1.41.0 | x_refsource_MISC |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-55370",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-10T20:14:33.407390Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T20:14:41.325Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "logto",
"vendor": "logto-io",
"versions": [
{
"status": "affected",
"version": "\u003c 1.41.0"
}
]
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"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"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-294",
"description": "CWE-294: Authentication Bypass by Capture-replay",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T19:56:53.317Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82"
},
{
"name": "https://github.com/logto-io/logto/pull/9109",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/logto-io/logto/pull/9109"
},
{
"name": "https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374"
},
{
"name": "https://github.com/logto-io/logto/releases/tag/v1.41.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/logto-io/logto/releases/tag/v1.41.0"
}
],
"source": {
"advisory": "GHSA-6wj7-c66m-6c82",
"discovery": "UNKNOWN"
},
"title": "Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55370",
"datePublished": "2026-07-10T19:56:53.317Z",
"dateReserved": "2026-06-16T18:57:40.181Z",
"dateUpdated": "2026-07-10T20:14:41.325Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-55370",
"date": "2026-10-05",
"epss": "0.00336",
"percentile": "0.24696"
},
"nvd": {
"cve": {
"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"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-55370",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-10T20:14:33.407390Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T20:14:37.931Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "logto",
"vendor": "logto-io",
"versions": [
{
"status": "affected",
"version": "\u003c 1.41.0"
}
]
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"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"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-294",
"description": "CWE-294: Authentication Bypass by Capture-replay",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T19:56:53.317Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82"
},
{
"name": "https://github.com/logto-io/logto/pull/9109",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/logto-io/logto/pull/9109"
},
{
"name": "https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374"
},
{
"name": "https://github.com/logto-io/logto/releases/tag/v1.41.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/logto-io/logto/releases/tag/v1.41.0"
}
],
"source": {
"advisory": "GHSA-6wj7-c66m-6c82",
"discovery": "UNKNOWN"
},
"title": "Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55370",
"datePublished": "2026-07-10T19:56:53.317Z",
"dateReserved": "2026-06-16T18:57:40.181Z",
"dateUpdated": "2026-07-10T20:14:41.325Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…