3rd October 2020
Risk level: Low
CVSS v3 Base Score: 5.3 (AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:L)
CWE: Storing Passwords in a Recoverable Format (CWE-257)
HackerOne report: 867164
A missing condition in Nextcloud Server 19 and prior caused the external storage app to always store the users password in a recoverable format.
The error has been fixed. Incorrectly stored passwords have been automatically cleaned-up from your database.
It is recommended that the Nextcloud Server is upgraded to 20.0.0.
The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory: