{"id":"CVE-2026-117470","title":"WebAuthn assertion replay permits second-factor bypass in Psono Server","summary":"Psono Server CE & EE versions 3.1.0 through 7.2.3 did not consume a stored WebAuthn challenge after assertion verification. An unauthenticated remote attacker who possessed the user's password and one captured valid WebAuthn assertion co…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","cvssSource":"cna","cwe":["CWE-294"],"vendor":"esaqa GmbH","product":"Psono","affected":["Psono >= 3.1.0 < 7.2.4"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T05:53:41.709Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117470","references":[{"url":"https://gitlab.com/esaqa/esaqa/security-advisories/-/blob/master/advisories/CVE-2026-117470.md","label":"Vendor security advisory for CVE-2026-117470"},{"url":"https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializers/webauthn_verify.py"},{"url":"https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495d"},{"url":"https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4"},{"url":"https://gitlab.com/esaqa/psono/psono-server"}],"tags":["cve.org"],"epss":0.00408,"epssPercentile":0.34915,"ingestedAt":"2026-10-27T16:11:59.222Z","slug":"CVE-2026-117470","body":"## Overview\n\nPsono Server CE & EE versions 3.1.0 through 7.2.3 did not consume a stored WebAuthn challenge after assertion verification. An unauthenticated remote attacker who possessed the user's password and one captured valid WebAuthn assertion could replay that assertion with separate login tokens while the stored challenge remained unchanged, bypassing the WebAuthn second factor. The attack required capture of a valid assertion and did not itself disclose plaintext secrets.\n\n## Affected\n\n- `Psono >= 3.1.0 < 7.2.4`\n\n## Remediation\n\nUpgrade to Psono Server 7.2.4 or later.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}