CVE-2026-117470Published

WebAuthn assertion replay permits second-factor bypass in Psono Server

Exact source revision recorded 27 Oct 2026 07:22:55 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-117470

Published

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.

Source published: 27 Oct 2026 05:53:41 UTC
Source modified: 27 Oct 2026 05:53:41 UTC
Observed here: 27 Oct 2026 07:22:55 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N