CVE-2026-117470

WebAuthn assertion replay permits second-factor bypass in Psono Server

Published Oct 27, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
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 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.

Remediation

Vendor Solution

Upgrade to Psono Server 7.2.4 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Esaqa
Esaqa psono
Vendors & Products Esaqa
Esaqa psono
Type Values Removed Values Added
Description 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 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.
Title WebAuthn assertion replay permits second-factor bypass in Psono Server
Weaknesses CWE-294
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
esaqa
Published
Updated
Nov 4, 2026, 3:01 PM
Reserved
Oct 27, 2026, 5:33 AM
Status
Deferred
Published
Oct 27, 2026, 6:17 AM
Modified
Nov 4, 2026, 3:17 PM