CVE-2026-55370

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.4
EG Score
6.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity64% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 13, 2026

Advisory Details (4)

Auto-updated Jul 10, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

TOTP code can be replayed within the RFC 6238 acceptance window · Advisory · logto-io/logto · GitHub

https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82
github_release Patch Available

v1.41.0

Patch available: logto-io/logto v1.41.0

https://github.com/logto-io/logto/releases/tag/v1.41.0
github_pr Patch Available

fix: prevent TOTP replay

Patch available: logto-io/logto v1.41.0 (PR #9109 merged 2026-06-30)

https://github.com/logto-io/logto/pull/9109
github_commit Patch Available

commit 9118867f6cba (logto-io/logto)

Patch available: logto-io/logto v1.41.0 (contains commit 9118867f6cba)

https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 05:17 UTCEG score recompute
  3. 2026-09-17 19:31 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
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  1. 2026-08-28 02:38 UTCEG score recompute
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  17. 2026-08-18 13:48 UTCEPSS rescore
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  26. 2026-08-14 13:18 UTCEG score recompute
  27. 2026-08-13 22:00 UTCEPSS rescore
  28. 2026-08-12 15:38 UTCEG score recompute
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  30. 2026-08-11 16:53 UTCEG score recompute
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  40. 2026-08-05 19:17 UTCEPSS rescore
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  45. 2026-08-03 10:36 UTCEPSS rescore
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  47. 2026-08-02 02:27 UTCEPSS rescore
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  55. 2026-07-28 15:37 UTCEPSS rescore
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  60. 2026-07-23 14:18 UTCEPSS rescore
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  62. 2026-07-22 14:08 UTCEPSS rescore
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  74. 2026-07-13 22:31 UTCEPSS rescore
  75. 2026-07-13 06:13 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-55370?
CVE-2026-55370 is a medium vulnerability published on July 10, 2026. 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 =…
When was CVE-2026-55370 disclosed?
CVE-2026-55370 was first published in the National Vulnerability Database on July 10, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55370 actively exploited?
CVE-2026-55370 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.0% of all scored CVEs.
What is the CVSS score of CVE-2026-55370?
CVE-2026-55370 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-55370?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55370, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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