CVE-2026-117470
WebAuthn assertion replay permits second-factor bypass in Psono Server
- State
- Published
- Severity
- 6.5 Medium
- Published
- Oct 27, 2026
- Updated
- Oct 27, 2026
- Reserved
- Oct 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N | esaqa |
Weaknesses
- CWE-294 Authentication Bypass by Capture-replay
Affected Products
| Product | Versions |
|---|---|
Psonoesaqa GmbH |
|
References
- Vendor security advisory for CVE-2026-117470vendor-advisory
- https://gitlab.com/esaqa/psono/psono-server/-/blob/v7.2.3/psono/restapi/serializers/webauthn_verify.pytechnical-description
- https://gitlab.com/esaqa/psono/psono-server/-/commit/9c9a7f1701535df63370340dcc80210737dc495dpatch
- https://gitlab.com/esaqa/psono/psono-server/-/releases/v7.2.4release-notes
- https://gitlab.com/esaqa/psono/psono-serverproduct
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