{"id":"CVE-2026-55370","aliases":["EUVD-2026-43011","GHSA-6wj7-c66m-6c82"],"status":"published","title":"Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)","description":"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":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00336,"percentile":0.27197,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-294"],"published":"2026-07-10T19:56:53Z","modified":"2026-10-28T02:30:43Z","products":[{"vendor":"logto-io","product":"logto"}],"references":[{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-6wj7-c66m-6c82","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/logto-io/logto/pull/9109","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/logto-io/logto/commit/9118867f6cbadc7291cf913beb4fede91ed5d374","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/logto-io/logto/releases/tag/v1.41.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55370.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55370","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-55370","title":"Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)","description":"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.","status":"published","published":"2026-07-10T19:56:53.317Z","modified":"2026-07-10T20:14:41.325Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-294"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-43011","description":"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.","status":"published","published":"2026-07-10T19:56:53Z","modified":"2026-07-10T20:14:41Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T18:20:02.308684Z"}],"nvd":[{"id":"CVE-2026-55370","description":"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.","status":"published","published":"2026-07-10T20:16:46.333Z","modified":"2026-10-25T15:10:00.147Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-294"],"updated_at":"2026-11-02T14:12:28.771746Z"}],"osv":[{"id":"CVE-2026-55370","title":"Logto: TOTP code can be replayed within the RFC 6238 validity window (one-time use violation)","description":"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.","status":"published","published":"2026-07-10T19:56:53.317Z","modified":"2026-10-28T02:30:43.056562977Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-294"],"updated_at":"2026-11-02T15:45:11.22012Z"}]}}