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.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Link | Tags |
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https://hackerone.com/reports/924393 | third party advisory exploit |
https://nextcloud.com/security/advisory/?id=NC-SA-2020-037 | broken link vendor advisory |