{"id":"CVE-2026-55370","title":"Logto is the modern, open-source auth infrastructure for SaaS and AI apps","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 bec…","severity":"medium","cvss":6.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-294"],"published":"2026-07-10","updated":"2026-07-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55370","references":[{"url":"https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/pull/9109","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/releases/tag/v1.41.0","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00336,"epssPercentile":0.27074,"ingestedAt":"2026-07-11T20:15:26.528Z","slug":"CVE-2026-55370","body":"## Overview\n\nLogto 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":35.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}