CVE-2026-55370

mediumCVSS 6.4covered by 1 sourcefirst seen 2026-07-10

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.

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Advisory coverage (1)

mediumCVE-2026-55370: Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Lo…nvd · 2026-07-10

External references

NVD record for CVE-2026-55370

CVE.org record

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