A wrong configuration in Nextcloud Server 19.0.1 incorrectly made the user feel the passwordless WebAuthn is also a two factor verification by asking for the PIN of the passwordless WebAuthn but not verifying it.
https://nextcloud.com/security/advisory/?id=NC-SA-2020-037
https://hackerone.com/reports/924393
Source: Mitre, NVD
Published: 2020-11-02
Updated: 2022-09-27
Base Score: 4.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P
Severity: Medium
Base Score: 6.8
Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H